问题描述：
1.—We would have walked to the station. It was so near.
—Yes. A taxi___________at all necessary.
A. wouldn’t be B. hadn’t been C. wasn’t D. hasn’t been
我选A，答案是C ，请大家帮忙解释一下为什么不能选A
2.It was 2 hours’ wait by the time the announcement_____________, saying my flight was canceled.
A. had been made B. was made C. made D. was making
我选A，答案是B，请大家帮忙解释一下为什么不能选B，及这个句型的时态搭配
3.If you read ___________the lines, you will know that they don’t really welcome us to attend the meeting.
A. within B. in C. between D.at
我选B，答案是C，请大家帮忙解释一下为什么不能选B，及C的含义
4.Try to avoid such things ___________will do you harm, unless you don’t care about the rumors from all directions.
我选A，答案是B，请大家帮忙解释一下为什么不能选B，及A与B的区别
A. that B. as C.which D.as that
5.Hardly __________the theatre and found our seats in the dark when the performance began.
A. whad entered B.did we enter C.we entered D.had we entered
我选B，答案是D，请大家帮忙解释一下为什么不能选B，及这个句型的时态搭配
谢谢
问题解答：
1. 你应该注意到了前句的would have walked to the station即would have done sth，其意思为“本可以...”，是对过去发生的事情的虚拟，隐含“事实上我们当初并没有步行去车站”的事实。
所以才有后句对当时发生的事实的描述(即当时打了的士车去车站)。所以后句所表达的含义也是对当时(过去)所发生的动作的描述，当然就用一般过去时了。
2. 句型：主句 + by the time + 从句。
此句型表明主句的动作是延续到从句动作发生的时间之内的，所以其时态搭配一般如下：
1）从句如果是一般过去时，则主句一般是过去完成时(如果是it be的结构则只需用一般过去时)；
2）从句如果是一般现在时，则主句一般是现在完成时或将来完成时。
3. 固定短语：read between the lines “领会字里行间的含义”
4. such...that...是“如此..以至于...”，that后接的是一个结果状语从句。也就是说后面的句子是一个以that引导的完整的句子。本题中如果用that，则will do you harm很明显缺少主语，所以不能用such...that...；
而such...as...结构中，as是定语从句的关系代词。as代替先行词things，并做定语从句中（ ）will do you harm的主语。
5. 固定句型：hardly...when... “一...就...”
when前的句子是“一...”，而when后的句子意为“就...”；
前句用过去完成时，后句则用一般过去时；
前句经常八hardly提前至句首，然后采用部分倒装，即把had提前，后句采用正常句序。
如：I had hardly entered the room when he left.
=Hardly had I entered the room when he left.
我一走进房间，他就离开了。
上海旅游网