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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单项选择题
Since the matter was extremely ______, we dealt with it immediately.
A．tough
B．tense
C．urgent
D．instant
单项选择题
The number of the employees ______ in this company.
A．have doubled
B．has doubled
C．are doubled
D．were doubled
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