Sofar,alloftheinfectedpeoplearethought_______thefluafterdirectcontact

So far, all of the infected people are thought _______ the flu after direct contact with sick birds.A.to have caughtB.having caughtC.to catchD.being caught

A解析试题分析：考查句型：Sb/sth is thought to do/to have done…某人/某物据认为正在做…/已经做…,如果不定式的动作是将要发生，用一般式，如果不定式的动作是先于主句的动作发生，用不定式的完成式，句意：到现在为止，所有的感染的人都被认为是在直接和病禽有过接触。选A。考点：考查固定句型：点评：Sb/sth is said /believed/thought to do/to have done…某人/某物据说正在做…/已经做…,这个句型可以变成：It is said/ believed /thought that…,还要注意用不定式的一般式还是完成式。

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