单项选择题

You'll miss the train______you hurry up.

A．unless
B．as
C．ff
D．until
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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 in
C．break away
D．break up
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
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