单项选择题

A．Reading.
B．Writing.
C．Speaking.
D．Listening.
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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.
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