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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Every student of English needs a good dictionary, but I can't afford ______.
A．it
B．this
C．that
D．one
单项选择题
He ______ that his guests were bored, although they were listening politely.
A．impressed
B．sensed
C．inferred
D．identified
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