As the mid- examination is coming the students are busy it.A. preparingB. prepare forC

问题补充：

As the mid- examination is coming , the students are busy it.

A. preparing

B. prepare for

C. prepare

D. prepareing for

答案：

A. preparing

(答案→)B. prepare for

C. prepare

D. prepareing for

解析：

此题考查固定短语be busy doing sth表示忙于做某事；prepare for sth表示为…做准备。