单项选择题

The days ______ you could travel without a passport are gone.

A．of which
B．on which
C．in which
D．at which
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单项选择题
The salesman had to ______ the conversation in order to wait on a customer.
A．break off
B．break away
C．break in
D．break up
单项选择题
It’s necessary that the problem ______in some way or other.
A．is settled
B．was settled
C．be settled
D．has been settled
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