题目内容
() 17. the factory,the students learned a lot about different machines.
A. When their stay in B. During their stay in
C. When they stayed to D. During they stayed in
B
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题目内容
() 17. the factory,the students learned a lot about different machines.
A. When their stay in B. During their stay in
C. When they stayed to D. During they stayed in
B