【題目】 I often doubt _________David is willing to help those homeless people.

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

【答案】A

【解析】

試題分析:句意:我常常懷疑是否大衛(wèi)愿意幫助那些無家可歸的人。A. whether是否;B. that 賓語從句的連接詞;C. when 何時;D. how如何。doubt表示疑問,排除B,結合句意理解,故答案為A。

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