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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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
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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