–When did Sam arrive Guangzhou?the morning of November 16th .A. at; InB. to; OnC. in;

问题补充：

–When did Sam arrive Guangzhou?

--the morning of November 16th .

A. at; In

B. to; On

C. in; At

D. in; On

答案：

A. at; In

B. to; On

C. in; At

(答案→)D. in; On

解析：句意：--Sam在什么时间到达广州？--在十一月十六日的早上。Arrive at/in小地方用at,大地点用in. 在具体某一天的上、下午用on。故选D