Question

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.

Answer 1

C

解析試題分析:句意：馬航370客機可能已經(jīng)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(yīng)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。
考點：考查情態(tài)動詞用法。