The 30th Olympic Games will be held in London about six weeks this year.A. atB. onC. after

问题补充：

The 30th Olympic Games will be held in London about six weeks this year.

A. at

B. on

C. after

D. in

答案：

A. at

B. on

C. after

(答案→)D. in

解析：考查介词的用法。“in+一段时间”意思是“过一段时间之后”，表示将来时间，常用于一般将来时。