单项选择题

You ought to know better than ______ yourself in unnecessary expense.

A．to involve
B．involve
C．involving
D．involved
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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
单项选择题
He walked across the meeting room ______ every one looking at him.
A．with
B．as
C．while
D．when
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