--- 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
网友回答
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
解析：可联系答.案.网客服索取。