单项选择题


A．Playing basketball.
B．Cleaning.
C．Shopping around.
D．Planning his work.
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单项选择题
A．About 20 hours.B．So long.C．Very fast.D．I usually go home by air.
A．About 20 hours.
B．So long.
C．Very fast.
D．I usually go home by air.
单项选择题
A．Teacher and student.B．Nurse and patient.C．Lawyer and client.D．Boss and secretary.
A．Teacher and student.
B．Nurse and patient.
C．Lawyer and client.
D．Boss and secretary.
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