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【参考答案】

began→begun
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单项选择题
A．＄80.B．＄20.C．＄40,D．＄60.
A．＄80.
B．＄20.
C．＄40,
D．＄60.
单项选择题
A．He has just returned from a long vacation.B．He doesn’t have enough time to take more classes.C．He was sick, but he is getting better.D．Only three classes are available to him right now.
A．He has just returned from a long vacation.
B．He doesn’t have enough time to take more classes.
C．He was sick, but he is getting better.
D．Only three classes are available to him right now.
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