问题补充:
The computer looks old, but it just half a year ago.
A. has been bought
B. will be bought
C. is bought
D. was bought
答案:
A. has been bought
B. will be bought
C. is bought
(答案→)D. was bought
解析:考查动词时态。本题容易错选A项。语境有具体过去时间“half a year ago”,因此buy表示过去的动作,用一般过去时被动语态。