Question

一道英语选择，请高手解答

Great changes have taken place in that school.It is no longer what it was 20years ago,______poorly equiped.
A.when B.which

Answer 1

选A。此句是缩略句，只要把最后一句还原为完整便可知道用when。
Great changes have taken place in that school.It is no longer what it was 20years ago, when( it was )poorly equiped.
那间学校发生了巨大的变化，它已经不再是20年前那样，当时它设备很简陋。
可见最后一句只是一个时间状语，是20 years ago的同位语，补充说明二十年前是怎样的状况。

Answer 2

when (it was)poorly equiped.
______poorly equiped实际上省略了it was。
若加上it was 之后 后面句子成分已完整。用when 做状语 引导状语从句。which引导定语从句时必须充当句子成分，而(it was)poorly equiped.句子完整 故用when

Answer 3

解释一下，伟大的变化发生在我们学校，不再是20年前的学校了。很多人看到时间会错误的用WHEN,但是这里应该用WHICH,指的是现在的学校

Answer 4

选A。这是一非限定性定语从句，用副词when

Answer 5

b which做从句主语