单项选择题

A．But if
B．But
C．If
D．And if
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单项选择题
A．CertainlyB．NoC．FortunatelyD．Probably
A．Certainly
B．No
C．Fortunately
D．Probably
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.
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