问题补充：
Our hometown is quite different from before.
A. that is was
B. what it was
C. which it was
D. when it was
答案：
A. that is was
(答案→)B. what it was
C. which it was
D. when it was
解析：what引导的从句作介词的宾语，并在从句中兼作表语，而that,which,when则不能。
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