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

游客2024-10-03  6

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 关系代词题。本句的后半部分为非限制性定语从句,由关系代词which引导,用来代替前文的内容,其他选项都不能引导非限制性定语从句。故[A]正确。
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