Nearly half a million people are believed _________ their homes in the past months as a result of the disaster.
A．to leave B．to have left C．to be leaving D．to be left
B

試題分析:考查非謂語的用法。句意：人們相信幾乎有50萬人在過去的數(shù)個月中由于災(zāi)難的原因而離開了家園。在句型sb /sth +is said to do 中，如果不定式動作發(fā)生過了，則用不定式的完成式to have done表示；如果將要發(fā)生，則用不定式的一般式to do表示；如果不定式動作正在發(fā)生，則用不定式的進行式to be doing表示。在此句中 in the past months 提示動作已經(jīng)發(fā)生，則應(yīng)該用不定式的完成式。所以B選項正確。
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