单项选择题

A．At 10:00.
B．At 8:00.
C．At 7:30.
D．At 8:30.
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单项选择题
A．The five questions were not well designed.B．Not all the questionnaires were returned.C．Only a small number of students were surveyed.D．Some of the answers to the questionnaire were not valid.
A．The five questions were not well designed.
B．Not all the questionnaires were returned.
C．Only a small number of students were surveyed.
D．Some of the answers to the questionnaire were not valid.
单项选择题
A．Worry about his family.B．Check locks.C．Look after children.D．Have a look round.
A．Worry about his family.
B．Check locks.
C．Look after children.
D．Have a look round.
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