The reason why Malaysia Airline Flight370 disappeared remained .A. look intoB. to be looked intoC. looking into D.to look into 题目和参考答案——青夏教育精英家教网—

题目内容

The reason why Malaysia Airline Flight370 disappeared remained_____.

A. look intoB. to be looked intoC. looking into D.to look into

【解析】

试题分析：句意：为什么马航370航班失联的原因还有待调查。这里使用了remain to be done“仍然有待被做”，使用不定式的被动语态，所以选B。

考点：考查不定式的被动

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