A.科技
B. 社会
C. 文化
D. 都是
第3题
When a fire( )at the National Exhibition, at least ten priceless paintings were completely destroyed.
A. broke off
B. broke out
C. broke down
D. broke up
第4题
Before she began to study at Beijing University, she( )in a factory for five years.
A. had worked
B. work
ed
C. has worked
D. would work
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