单项选择题

______ is very useful for us students______ English well.

A． This; learn
B． It; learns
C． It; to learn
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单项选择题
I think Chinese food is quite different ______ American food.
A． from
B． in
C． to
单项选择题
-- Why won't you go to the movie with me, Betty-- Because I ______ it twice.
A． saw
B． have seen
C． will see
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