六、非谓语动词
1.nearly half a million people are believed ________ their homes as a result of the disaster.
a.to leave b.to be left
c.to be leaving d.to have left
答案 d [句意:据说有将近50万人因为这场灾难离开了他们的家园。sb be believed to do“据信某人做……”,且leave表示的动作发生在谓语动词believe表示的动作之前,故用不定式的完成式。]
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