【題目】We found ______ very important to keep the light out of a darkroom.

A.it’sB.thatC.itD.不填

【答案】C

【解析】

考查it的用法。句意：我們發(fā)現(xiàn)不要讓光線進入暗室是很重要的。find后要跟it做形式賓語，指代后文不定式這個真正賓語，故選C。

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