单项选择题

A．being
B．was
C．been
D．is
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单项选择题
A．UnlessB．ThoughC．IfD．As
A．Unless
B．Though
C．If
D．As
单项选择题
A．Student and professor.B．Customer and shop assistant.C．Patient and doctor.D．Client and lawyer.
A．Student and professor.
B．Customer and shop assistant.
C．Patient and doctor.
D．Client and lawyer.
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