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
网友回答
A. to work
B. to be working
(答案→)C. to have worked
D. to have been working
解析：考查不定式的时态。事情发生在过去，不定式要用完成式，所以选C。