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The reason why Malaysia Airline Flight370 disappeared remained_____.

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

 

B

【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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