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【题目】________he has finished writing the novel is unknown.

A. If B. Whether C. When D. While

【答案】B

【解析】考查主语从句引导词。句意:他是否已经写完小说还不知道。主语从句放句首表“是否”用whether,不用if。注意不能选when,如果要用when,则主语从句中要用一般将来时。

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