问题补充：
—Is Bob still teaching?
—I’m afraid not. He is saidthe school as he has become a businessman.
A. that he has left
B. to leave
C. to have left
D. to be left
答案：
A. that he has left
B. to leave
(答案→)C. to have left
D. to be left
解析：根据“as he has become a businessman.”可判断出不定式动作leave发生在谓语动词表示的动作之前，故用不定式的完成时，故选C。
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