They overcame all the difficulties and completed the project two months ahead of

游客2025-05-04 25

问题 They overcame all the difficulties and completed the project two months ahead of time,______is something we had not expected.

选项 A、which
B、it
C、that
D、what

答案 A

解析本题考查非限定性从句。句子前半部分作后半部分的逻辑主语，可用关系代词which代替。另外，也可用连词+that引导。

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