单项选择题

A．Every twenty minutes.
B．Every half an hour.
C．Once a day.
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单项选择题
A．He’s afraid to take exams.B．He only took the fourth exam.C．He didn’t get the highest score on one exam.
A．He’s afraid to take exams.
B．He only took the fourth exam.
C．He didn’t get the highest score on one exam.
单项选择题
A．On Saturday.B．From Monday to Friday.C．On Sunday.
A．On Saturday.
B．From Monday to Friday.
C．On Sunday.
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