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【参考答案】

are→were
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单项选择题
A．On a train.B．In a classroom.C．In a bar.
A．On a train.
B．In a classroom.
C．In a bar.
单项选择题
A．Make up homework problems.B．Do research in the library.C．Grade homework sets.
A．Make up homework problems.
B．Do research in the library.
C．Grade homework sets.
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