摘要： Great changes have taken place in that school.It is no longer it was 20 years ago. it was so poorly equipped. A.what;when B.that;which C.what;which D.which;that 答案 A 解析 第一个从句是表语从句并在从句中作表语.所以用what,后面是一个when引导的定语从句.其先行词是20 years ago.

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