问题补充：
--- How nice the bike is! How long you it？--- Just two weeks.
A. have, bought
B. did, buy
C. have, had
D. did, have
答案：
A. have, bought
B. did, buy
(答案→)C. have, had
D. did, have
解析：句意：这辆自行车多好呀！你买了多久了？刚刚两周。动作从过去延续到现在，用现在完成时态。和一段时间连用，用延续性的动作或状态。buy 对应的延续性动作是，have，故选C
