问题补充：
----That must have been a long trip.
-------Yeah, it us a whole week to get there.
A. takes
B. has taken
C. took
D. was taking
答案：
A. takes
B. has taken
(答案→)C. took
D. was taking
解析：考查动词时态辨析。：句意：“那一定是一次长途旅行。”“是，到那儿花费我们整整一周时间。”根据第一句话的must have been可知事情发生在过去，故选C。
