单项选择题

If you want to improve the taste, try ______ some sugar.

A．to add
B．to adding
C．add
D．adding
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单项选择题
You have to take the ______ examination before an interview can be considered.
A．precious
B．preliminary
C．prior
D．potential
单项选择题
He seemed to be looking for words at his desk ______ to convey his meaning as precisely as I had done.
A．that
B．where
C．with which
D．from which
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