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.
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单项选择题
A．To put the homework on Don’’s desk.B．To leave the master key for Don.C．To give Don’’s students the next assignment.D．To call Don at the end of the afternoon.
A．To put the homework on Don’’s desk.
B．To leave the master key for Don.
C．To give Don’’s students the next assignment.
D．To call Don at the end of the afternoon.
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