问题描述：
Carol said the work would be done by October,______ personally I doubt very much.
A.it B.that C.when D,which
关系代词which代替Carol所说的话,这里为什么不能填that
A.it B.that C.when D,which
关系代词which代替Carol所说的话,这里为什么不能填that
问题解答：
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