Question

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

A．to have caught

B．having caught

C．to catch

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。