—Is Bob still teaching?—I’m afraid not. He is saidthe school as he has become a businessma

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。