【題目】He sometimes asked himself the question ______ his research was worth devoting his life to.

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

【答案】C

【解析】句意:他有時(shí)候問自己這個(gè)問題——他的研究是否值得將他的畢生都投入進(jìn)去。根據(jù)句意,可見是表示懷疑,所以要選表是否的詞;而空缺處引導(dǎo)同位語從句,______ his research was worth devoting his life to作the question的同位語,if不能引導(dǎo)同位語從句,故選C項(xiàng)。

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