— did the meeting last? —For two hours.A. How oftenB. whenC. How longD. How soon

问题补充：

— did the meeting last? —For two hours.

A. How often

B. when

C. How long

D. How soon

答案：

A. How often

B. when

(答案→)C. How long

D. How soon

解析：考查连词，How often多久一次，表示频率，when当什么时候，How long多长时间，How soon多久，表示将来，根据答语内容—For two hours，可知答案为how long选C。