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【题目】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:他有时候问自己这个问题——他的研究是否值得将他的毕生都投入进去。根据句意,可见是表示怀疑,所以要选表是否的词;而空缺处引导同位语从句,______ his research was worth devoting his life to作the question的同位语,if不能引导同位语从句,故选C项。

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