单项选择题

The salesman had to______the conversation in order to wait on a customer.

A．break off
B．break in
C．break away
D．break up
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单项选择题
They ______ to have done such silly things.
A．had ought
B．hadn't ought
C．didn't ought
D．ought not
单项选择题
It's necessary that the problem ______ in some way or other.
A．is settled
B．be settled
C．was settled
D．has been settled
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