单项选择题

The first thing ______ we should do is to work out a plan.

A．which
B．that
C．where
D．what
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单项选择题
I ______ two hours on this math problem.
A．spent
B．paid
C．cost
D．taken
单项选择题
The flowers ______ sweet.
A．are smelt
B．smell
C．is smelt
D．smells
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