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

試題分析：考查句型：sb/sth is thought to do/to have done…某人/某物據(jù)認為正在做…/已經做…,如果不定式的動作是將要發(fā)生，用一般式，如果不定式的動作是先于主句的動作發(fā)生，用不定式的完成式，句意：到現(xiàn)在為止，所有的感染的人都被認為是在直接和病禽有過接觸。選A。
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