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
Either of the children______quite capable of looking after the baby.
A．are
B．is
C．be
D．have been
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