问题
选择题
They _____ in a factory now, but they _____ there a year ago.[ ]
A. works; not worked
B. work; didn't work
C. works; isn't working
D. is working; works
答案
答案：B
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They _____ in a factory now, but they _____ there a year ago.[ ]
A. works; not worked
B. work; didn't work
C. works; isn't working
D. is working; works
答案：B