单项选择题

A．how
B．why
C．nothing but
D．nothing like
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单项选择题
A．Doctor and patient.B．Student and teacher.C．Sales assistant and customer.D．Manager and office clerk.
A．Doctor and patient.
B．Student and teacher.
C．Sales assistant and customer.
D．Manager and office clerk.
单项选择题
A．But ifB．ButC．IfD．And if
A．But if
B．But
C．If
D．And if
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