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

試題分析:句意：馬航370客機可能已經改變航向，折返吉隆坡——但是沒有飛行員這樣做的跡象。A肯定做過某事；B本來有可能做（但是沒做）；C可能做過；D本應該做（但是沒做）。根據(jù)破折號后可知這是猜測可能發(fā)生過的事情，故答案選C。
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