—When did you come here?—______________.A. Half an hour beforeB. Since half an hourC. Half an hour agoD. For half an hour①请问这道题选A还是C呢？这两个选项又有什么区别呢？②对since和for提问是用when还是how long？
...h the first houses of the
town, than a general rush takes place; away
each then starts toward his home; and it is really curious to stand still
and watch how very quickly they canter by, greedily grunting and snuffing, as
if they could smell with their stomachs, as well as their noses, the savory
fo...
...个句子 To talk about an event that takes place at the same time as some longer action or event.我对结构的理解是takes place at the same time修饰event，意思是“同时发生的事”，后面some longer action or event是adj+n的结构，本质上就是名词，这个时候as就是关...
... will be staying for five days. During this time, they will give five performances. As usual, the police will have a difficult time. They will be trying to keep order. It is always the same on these occasions.我的疑问1：这里面除了除了划横线的其他句子都是将来进...
How silly it is to travel out by high-speed rail _____you can take a plane,whichis much cheaper.A.while B.when C.since D.though答案选B，可是C有既然的意思也能说通为什么不选？
对句型"It is/has been +段时间+since+延续动词一般体/完成体"表达语意的疑问：1.It's been three years since I worked in this company.2.It's been three years since I have worked in this company.我手头的语法书有两种对立观点，第一种认为，在此句型中，无论...
老师好！在理解句子It has been three months since we had winter vacation的时候我遇到问题：have winter vacation这个动词短语的动词have是非延续动词还是延续性动词？如果have在这里是非延续性动词，It has been three months since we had winter vacation是...
...难解答人教版必修1-第2单元（每日更新） ▲P23▲No.1 in the younger sort的理解难点No.2 talk about后面可以接动名词吗▲P24▲No.1 over
the holiday, on the holiday, in the holiday的区别No.2 新教材高中英语(人教版)必修一第2单元（p24）听力原文...