【題目】The workers overcame all the difficulties and completed the project two months ahead of time,

______ is something we had not expected.

A.whatB.thatC.whichD.it

【答案】C

【解析】

考查非限制性定語從句。句意：他們戰(zhàn)勝了種種困難，并提前兩個月完成了任務，這是我們所沒有預料到的。因為后面句子是用來修飾前面的句子的，所以是一個定語從句。空白處的詞應指代整個上句，并在從句中做主語，且由于這句話屬于非限定性定語從句，所以引導詞只能是which。故選C。

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