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

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

【答案】B

【解析】考查主語從句引導詞。句意:他是否已經(jīng)寫完小說還不知道。主語從句放句首表“是否”用whether,不用if。注意不能選when,如果要用when,則主語從句中要用一般將來時。

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