问题
选择题
— When _________ this kind of computer ________?
— Last year. [ ]
A. did; use
B. was; used
C. is; used
D. are; used
答案
答案：B
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— When _________ this kind of computer ________?
— Last year. [ ]
A. did; use
B. was; used
C. is; used
D. are; used
答案：B