1）When you read the book,you'd better make a mark_____you ha

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1）
When you read the book,you'd better make a mark_____you have any questions.
A.at which B.at where C.the place where D.where
这个题正确答案是D
2）
---What was the party like?
---Wonderful.It's years _____I enjoyed myself so much.
A.after B.before C.when D.since
before和since怎么区分?
3）
Why do you want a new job ____you've got such a good one already?
A.that B.where C.which D.when
为什么不能用that而要用when呢?
4）---I'm going to the post office.
---______you're there,can you get me some stamps?
A.as B.while C.because D.if
这里as和while怎么用?怎么区分?
5）_________,it was finished in time.
A.As was the work difficult B.Difficult as was the work
C.Difficult as the work was D.As the work was difficult
这个应该选C,它的语序应该是怎样的?D错在哪里?
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可是第四个的答案是while不是as
还有第五个能解释清楚一点吗？

1）B不对.B中的at改成in也不对.
这是一个定语从句,where引导定语从句修饰先行词mark,
意思是,你最好做一个标记.在哪里做标记呢?在你有问题的地方.
A中的at改为in,是正确的,因为定语从句引导词中in which=where.
2）
It is/has been + 一段时间 + since + 从句.
It will be/was + 一段时间 + before + 从句.
这是个基本句型,作文中用可以提高分数,并不是可以打100分...
3）
从句you've got such a good one already,不缺少成分,不需要用定语从句.
可以排除A,C.
already,这个词充分说明了这是在强调时间,用where也翻不通.只能用when.
4）这里不是一个时间状语从句,而是原因状语从句.
while不能引导原因状语从句,排除B.
because语气比as重,多用于回答why引起的疑问句,用在这里不合适.
if显然不和题意.
选A.
5)这是个让步状语从句,翻译为：虽然这项工作很难,但是它还是被及时完成了.
as引导让步状语从句,必须部分倒装,倒装原则是adj.+as+主语+谓语,
所以不能选D,D就是正常语序.

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