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 changed
B. could have changed
C. might have changed
D. should have changed.
网友回答
A. must have changed
B. could have changed
(答案→)C. might have changed
D. should have changed.
解析：
试题分析:句意：马航370客机可能已经改变航向，折返吉隆坡——但是没有飞行员这样做的迹象。A肯定做过某事；B本来有可能做（但是没做）；C可能做过；D本应该做（但是没做）。根据破折号后可知这是猜测可能发生过的事情，故答案选C。