Question

So far, all of the infected people are thought _______ the flu after direct contact with sick birds.

1. A.
   to have caught
2. B.
   having caught
3. C.
   to catch
4. D.
   being caught

Answer 1

A
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。