----What a nice bike! How long you it?Just two weeks.A. have boughtB. did buyC.

问题补充：

----What a nice bike! How long you it?

----- Just two weeks.

A. have, bought

B. did, buy

C. have, had

D. are, having

答案：

A. have, bought

B. did, buy

(答案→)C. have, had

D. are, having

解析：句意：多漂亮的单车啊！你买了多长时间了？就两周。How long 多久，是持续的时间；buy买，是瞬间动词，不能与表示持续的时间连用，have有，是表状态，可以与时间段连用，故选C。