单项选择题

（）we need air and water, so do we need criticism and self-criticism.

A．Even though
B．So long as
C．Just as
D．Now that

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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

It isn't quite （）that he will be present at meeting.

A．sure
B．right
C．exact
D．certain

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