—I’m sure Mary will pass the driving test. —I think so. She for it for months.A. is prepar

问题补充：

—I’m sure Mary will pass the driving test.

—I think so. She for it for months.

A. is preparing

B. was preparing

C. has been preparing

D. had prepared

答案：

A. is preparing

B. was preparing

(答案→)C. has been preparing

D. had prepared

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