It is impolite you to ring off when others haven’t finished their talking on the phone.A.

问题补充：

It is impolite you to ring off when others haven’t finished their talking on the phone.

A. for

B. from

C. to

D. of

答案：

A. for

B. from

C. to

(答案→)D. of

解析：

试题分析:句意，在电话上当别人没有结束谈话时你挂断电话是不礼貌的。For多表示动作的原因、目的等。From表示来自哪里。To表示动作的对象，方向等。Of多用来说明事物的性质能。Be impolite of ……是不礼貌的，Be impolite to do sth做某事是不礼貌的。故选D。

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