单项选择题

A．By prediction.
B．By recording.
C．Through observation.
D．Through interviewing.
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单项选择题
A．He can come another time.B．There would be more fun without the roommate.C．It is no problem if the roommate refuses to come.D．Bring the roommate along and enjoy the good time.
A．He can come another time.
B．There would be more fun without the roommate.
C．It is no problem if the roommate refuses to come.
D．Bring the roommate along and enjoy the good time.
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