单项选择题

A．when
B．because
C．since
D．as
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单项选择题
A．presentB．manipulateC．transmitD．represent
A．present
B．manipulate
C．transmit
D．represent
单项选择题
A．Waiter and customer.B．Doorkeeper and visitor.C．Servant and hostess.D．Shop-assistant and customer.
A．Waiter and customer.
B．Doorkeeper and visitor.
C．Servant and hostess.
D．Shop-assistant and customer.
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