题目内容

Harrison Ford is thought to be one of the few movie stars ____ as a carpenter before.
A．to work B．to be working
C．to have worked D．to have been working
C

试题分析：考查不定式用法。本题中不定式做定语修饰movie stars；因为后面有时间状语before说明这是一个已经完成的动作，故使用不定式的完成时表示一个已经完成的动作。故C正确。
点评：不定式的完成式表示在谓语动词之前已经完成。
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