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【参考答案】

24-hours→24-hour
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单项选择题
A．A half hour.B．15 minutes.C．20 minutes.D．An hour and a half.
A．A half hour.
B．15 minutes.
C．20 minutes.
D．An hour and a half.
单项选择题
A．It’s fine as it is.B．Only a few changes should be made in it.C．Major revisions am needed in it.D．It won’t be approved by the supervisor.
A．It’s fine as it is.
B．Only a few changes should be made in it.
C．Major revisions am needed in it.
D．It won’t be approved by the supervisor.
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