It’s not polite to enter the other’s room knocking on the door.A. byB. withC. withoutD. f

问题补充：

It’s not polite to enter the other’s room knocking on the door.

A. by

B. with

C. without

D. from

答案：

A. by

B. with

(答案→)C. without

D. from

解析：by被，通过，依据，经由，乘坐。with用，随着，支持，表示伴随。without没有，超过，在外面。from从。句意：不敲门进入别人的房间是不礼貌的。故选C。