题目内容
The operation turned out to be very successful, _________ was more than we could expect.
A. what B. which C. that D. it
B
which引导非限制性定语从句修饰整个句子。

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题目内容
The operation turned out to be very successful, _________ was more than we could expect.
A. what B. which C. that D. it
B
which引导非限制性定语从句修饰整个句子。