--- Is Bob still working in your school? --- I’m afraid not. He is said and in a private s

问题补充：

--- Is Bob still working in your school?

--- I’m afraid not. He is said and in a private school recently.

A. to resign; to teach

B. to have resigned; to teach

C. to resign; to be teaching

D. to have resigned; to be teaching

答案：

A. to resign; to teach

B. to have resigned; to teach

C. to resign; to be teaching

(答案→)D. to have resigned; to be teaching

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