The Ninth Garden Expo is on May 18th Fengtai.A. inB. onC. atD. to

问题补充：

The Ninth Garden Expo is on May 18th, Fengtai.

A. in

B. on

C. at

D. to

答案：

(答案→)A. in

B. on

C. at

D. to

解析：句意：第九届园林博览会于5月18日在丰台区举行。in后接地点，on接具体的时间，故选A