单项选择题

The news of the air crash is not yet ______ by the government.

A．committed
B．confirmed
C．considered
D．concerned
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单项选择题
You ought to know better than ______ yourself in unnecessary expense.
A．to involve
B．involve
C．involving
D．involved
单项选择题
It isn't quite ______ that he will be present at meeting.
A．sure
B．right
C．exact
D．certain
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