问题补充：
--What a beautiful bike! How long have you it?
--My mother just it for me as my graduation gift yesterday. I like the colour, it’s so cool..
A. bought ,bought
B. had, bought
C. buy, send
D. had, sent
答案：
A. bought ,bought
(答案→)B. had, bought
C. buy, send
D. had, sent
解析：
试题分析:：句意：多漂亮的自行车啊！你买了多久了。我妈妈昨天买给我做为毕业礼物的。我喜欢这个颜色，很酷。yesterday为一般过去时标志词，buy为瞬间动词，用于现在完成时需转换成延续性动词have,故选B.
