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问题 back up是什么意思

As our scientific institution began to open back up and whispers about face to face lab meetings started to float around, I panicked.句中back up是什么意思？

问题 语法填空里什么时候用不定冠词和定冠词

...空：These are called polymorphic. "polymorphic" means______ ability to take different forms. 答案给的是 the，请问此处为什么不能填 an。前文也并没有出现 ability。一般来说语法填空里填定冠词都是前文有出现同样词的，如果填不定冠词，一般是前...

问题 伴随状语问题

No jurisdiction so far has tried using age verification methods like biometrics or government identification to enforce a social media age cut-off, two of the methods being trialed.这句话最后two of ......从语法结构是不是伴随状语？

问题 这里是否当作同位语理解

... desert plain, a dry lake bed in California surrounded by mountains and on the desert floor these huge rocks, some of them hundreds of pounds.这是托福TPO4听力中的一段话，其中on the desert floor these huge rocks感觉不通顺，没有谓语或者非谓语，these huge rocks是当同位...

问题 英语时态和语态考题

...ton was,many of his ideas ______ till today and are being modified by the work of scientists of our times.A. are to challenge B. may be challenged C. have been challenged D. are challenging老师，till是不是现在完成时的时间标志啊? 这道题怎么翻译啊？为什么要选择现...

问题 宾语从句前的介词

语法填空： A man hiking in a heavily wooded area of  northern New Jersey was killed by a black bear during the weekend, the police said on Monday, in what experts called an extremely rare attack.问：in what experts called an extremely rare attack.中填what，答案说是填what ，作call...

问题 as soon as possible

i suggested that Jack should finish his job as soon as possible.请问老师，为什么as 后面能直接跟possible？是不是省略了什么？如何理解？

问题 as引导比较分句的句式分析

这是我在牛津字典上看到的一句句子：She lost it, just as I said she would.请问这句话省略了什么，如果还原的话，该怎么写？

问题 为什么不加ing

There is no point me doing this if I can't be myself为什么point不加ing？

问题 现在完成时态的问题

I have worked in this company.这句话能否包含“现在不在这家公司了，是过去的经历”的意思。句子用的是现在完成时态，现在完成时态表示：开始于过去的动作一直持续到现在，而且还可能继续持续下去。那么上面的句子是否有可...

问题 responses,responded,responding,respondent的用法疑问

Since Solano Marketing was established,the human resoureces department has counted on newspapers to advertise job opentings in the company.However,we have observed that ____ to printed advertisements have dropped since the onset of online employment agencies.A. responses        B...

问题 with复合结构的宾语是否只能用名词或名词短语充当

同理，独立主格结构的逻辑主语是否也只能用名词或名词短语充当？

问题 可以说sb is done吗？

在一章非谓语动词的专题里有这样一个句子：When you’re done, give us a call. 等你干完了，给我打个电话。句中的are done 用得对吗？我觉得应是 have done。是不是资料上印错了？谢谢解答！

问题 by hand与with one’s hand有何区别

by hand与with one’s hand的区别是什么? 它们翻译成汉语都是“用手”吧？

文章 both与alike、each other、together能否连用

both与alike, each other, together能否连用■倪肖丁（西安） 《当代英美语惯用法词典》（江希和著，上海外语教育出版社 2001）认为：有both的句子中，其动词用来强调“两个”作为一起看待的相同的“人”或“物”，也即将两个“人...