问题：
--- When did Tom come to Qingdao？
--- It was in July，2006 and he ______ a trip in China with his parents at that time.
A.would take
B.had taken
C.was taking
D.had been taking
--- When did Tom come to Qingdao？
--- It was in July，2006 and he ______ a trip in China with his parents at that time.
A.would take
B.had taken
C.was taking
D.had been taking
--- It was in July，2006 and he ______ a trip in China with his parents at that time.
A.would take
B.had taken
C.was taking
D.had been taking
参考答案：