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一道英语选择,Great changes have taken place in that school.It is n

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一道英语选择,
Great changes have taken place in that school.It is no longer what it was 20years ago,______poorly equiped.
A.when B.which
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