They will arrive Guangzhou the ninth of July.A. at at B. in inC. in onD. to on

问题补充：

They will arrive Guangzhou the ninth of July.

A. at, at

B. in, in

C. in, on

D. to, on

答案：

A. at, at

B. in, in

(答案→)C. in, on

D. to, on

解析：arrive at +sp，表示到达某地，或arrive in +sp，表示到达某地，其中at+小地点，in +大地点，on后接具体一天，故选C。