【題目】Therearemanymysteriesto______byscientists.

A.discoverB.discovering

C.bediscoveredD.bediscovering

【答案】C

【解析】

句意:科學(xué)家們要發(fā)現(xiàn)許多謎團(tuán)。

考查被動(dòng)語態(tài)。discover發(fā)現(xiàn),原形;discovering發(fā)現(xiàn),現(xiàn)在分詞;be discovered被發(fā)現(xiàn),被動(dòng)語態(tài);be discovering發(fā)現(xiàn),進(jìn)行時(shí)。這里是動(dòng)詞不定式作后置定語,這里是說被科學(xué)家發(fā)現(xiàn)的許多秘密。用被動(dòng)語態(tài)be done的形式,動(dòng)詞不定式后加動(dòng)詞原形,故選項(xiàng)C符合題意。故選C

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