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

試題分析：考查不定式用法。本題中不定式做定語(yǔ)修飾movie stars；因?yàn)楹竺嬗袝r(shí)間狀語(yǔ)before說(shuō)明這是一個(gè)已經(jīng)完成的動(dòng)作，故使用不定式的完成時(shí)表示一個(gè)已經(jīng)完成的動(dòng)作。故C正確。
點(diǎn)評(píng)：不定式的完成式表示在謂語(yǔ)動(dòng)詞之前已經(jīng)完成。
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