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【题目】There are many mysteries to ______ by scientists.

A.discoverB.discoveringC.be discoveredD.be discovering

【答案】C

【解析】

句意:有很多秘密等待科学家们去发现。

考查动词辨析。discover发现,动词原形;discovering动名词或现在分词形式;be discovered被动形式;be discovering进行式。这里考查了句型there be sth.to be done.意为“有某事要做”。故选C

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