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People are puzzled____they read the book.
A the first time B at the first time
C for the first time D at first
You'd better make a mark____you have any questions.
A at which B at where C the place where
要解释清楚啊
A the first time B at the first time
C for the first time D at first
You'd better make a mark____you have any questions.
A at which B at where C the place where
要解释清楚啊
C for the first time作时间状语，如用the first time应放句首啊
A at which 或用where作地点状语啊
1。A
我觉得这一句可以变一下：
The first time people read the book they are puzzled.the 我记得老师说过名词性短语（the first time）开头的句子前面好象不加介词我记得我老师还讲过一道相似的例题
2。B
这是一个定语从句，选后B的句子为
You'd better make a mark at where you have any questions.
at虽然放在where前面，但它实际应放在questions的后面，这个句子只不过把at提前了，整句也可变为
You'd better make a mark where you have any questions at.
我对我的答案只有80%的把握，我争取在你问题到期前去查查我的英语笔记，如果有误，我再争取告诉你
第一题选A，动词过去时后面直接跟名词。
第二题选B，which是哪个的意思，where才是哪里。
1.A
the first time是作时间状语,前面不要加任何介词,所以排除B和C选项;D选项不符合题意.
2.A
对于B选项,at多余了，where==in which==at which
对于C选项,the place 与where重复了．
1-A the first time直接做状语
2-A at which=where 介词at后不能跟where
1A 2 where