单项选择题

A．difficulty
B．trouble
C．case
D．problem
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单项选择题
A．inB．forC．asD．at
A．in
B．for
C．as
D．at
单项选择题
What is the relationship of the two people most likely to be
A．Salesperson and customer.
B．Doctor and patient.
C．Receptionist and tourist.
D．Lawyer and client.
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