The American Academy of Sleep Medicine offers a number of reasons that may be causing your particular variant of hypnagogic jerks. Unfortunately, the spectrum of explanations is so broad that it really doesn't help narrow down much at all.这句话最后的much是做narrow的宾语还是修饰at all...
误：It is no more expensive than would the system you are proposing be. 正：It is no more expensive than would be the system you are proposing. 请专家老师分析一下这两个句子，“误”句错在哪里？“正”句为什么正确？句子是什么意思？谢谢！
有一道题：
It is_______nice of you to say so.
A. truly
B. true
C. really
D. real
答案选C. 老师讲truly和really 可互换，但really更常用，所以选really。我想请教，本题选A可否，truly和really的区别。请专家赐教，谢谢！
If we_______200 years old,we______everything.A.were to be,could change B.had been,changed C.were,would have changed D.should be, changed.这道题，C为什么不对，从句对现在事实的虚拟，主句对过去事实的虚拟。就像“我要是...
It could be anything—gardening,cooking,music,sports—but whatever it is,______(make)sure it's a relief from daily stress rather than another thing to worry about.填的答案是make。第二个破折号（红色的）在语法上有什么功能？but连接的是哪两个句子？
-- I was trying
to repair that stupid machine, but I failed.-- Well,
you_______.A. needn't do
that B. needn't have done C. needn't have D. needn't这道题该选哪一个呢，如果B是needn't have done
that是否正确？dare和need在省略方面的用法一样吗？
I'm sorry to have kept you waiting long.A：Never mind. I waited here for only a few minutes.B：Never mind. I have been here for only a few minutes.以上这两个回答的区别在哪里呢？
The number you dialed is power off. 这是目前都在应用的回复；但是也有见过说这个句子是有错误的，应该改为The number you dialed is powered off. power off做短语动词，用于被动语态。但是在第一个句子种，个人感觉也没有什么错误， power o...