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【題目】I don’t know he has time to help us. Let’s ask him.

A. that B. whether C. how D. what

【答案】B

【解析】句意:我不知道他是否有時間幫助我們,讓我們問問他吧。that是連詞,引導賓語從句,沒有意義,在從句中也不做成分;whether 是否;how怎樣;what什么,是連接代詞,在從句中做主語或賓語。根據句意可知,說話人不知道他是否有時間,因此應選B。

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