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
He ______ that his guests were bored, although they were listening politely.
A．impressed
B．sensed
C．inferred
D．identified
单项选择题
The fact that something is cheap doesn't ______ mean it is of low quality.
A．necessarily
B．especially
C．essentially
D．practically
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