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问题: 一道英语题

He said the work would be done by October ______ personally I doubt very much.
A.it B.that C.when D.which

解答:

选D.引导定语从句,代指前面整个主句。意为“这一点,这件事”
他说工作能于十月前完成,这一点让我很是怀疑。