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Malaysia Airlines Flight 370 ___________ course and turned back toward Kuala Lumpur -- but there were no indications from the pilot that he was doing so.

A.must have changedB.could have changed
C.might have changedD.should have changed.

C

解析试题分析:考查情态动词。根据句意:马来西亚的370航班可能改变了航道回到吉隆坡——但是并没有什么迹象表明飞行员要这样做。A肯定干了某事;B本可以干某事;C可能干了某事;D本应该干某事。所以答案选C。
考点:考查情态动词

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