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【题目】Therearemanymysteriesto______byscientists.

A.discoverB.discovering

C.bediscoveredD.bediscovering

【答案】C

【解析】

句意:科学家们要发现许多谜团。

考查被动语态。discover发现,原形;discovering发现,现在分词;be discovered被发现,被动语态;be discovering发现,进行时。这里是动词不定式作后置定语,这里是说被科学家发现的许多秘密。用被动语态be done的形式,动词不定式后加动词原形,故选项C符合题意。故选C

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