The mid-term exam is to be held the end of this month.A. onB. byC. inD. at

问题补充：

The mid-term exam is to be held the end of this month.

A. on

B. by

C. in

D. at

答案：

A. on

B. by

C. in

(答案→)D. at

解析：at the end of意思是：在…结尾,在…末端。