—What are you doing Mum?—I amthe carpet in order to get rid of the dust in it.A. beatingB.

问题补充：

—What are you doing,Mum?

—I amthe carpet in order to get rid of the dust in it.

A. beating

B. hitting

C. striking

D. patting

答案：

(答案→)A. beating

B. hitting

C. striking

D. patting

解析：考查动词的区别。beat“连续的击打”；hit强调击中；strike 强调用力打；pat指用手或扁平物“轻拍”。只有beat符合语境。