22．trying to persuade his father to give up smoking his letter was rejected.A. Aiming atB

问题补充：

22．trying to persuade his father to give up smoking, his letter was rejected.

A. Aiming at

B. Aimed at

C. Being aimed at

D. to aim at

答案：

A. Aiming at

(答案→)B. Aimed at

C. Being aimed at

D. to aim at

解析：可联系答.案.网客服索取。