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

A.discoverB.discoveringC.be discoveredD.be discovering

【答案】C

【解析】

句意:有很多秘密等待科學家們?nèi)グl(fā)現(xiàn)。

考查動詞辨析。discover發(fā)現(xiàn),動詞原形;discovering動名詞或現(xiàn)在分詞形式;be discovered被動形式;be discovering進行式。這里考查了句型there be sth.to be done.意為“有某事要做”。故選C。

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