单项选择题

You can't be ______ careful in making the decision as it was such a critical case.

A．very
B．quite
C．too
D．so
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单项选择题
Problems common to most countries include the social, economic ______ problems.
A．and politics
B．and with government
C．of government
D．and political
单项选择题
These excursions will give you an even deeper ______ into our language and culture.
A．inquiry
B．investigation
C．input
D．insight
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