问题

As we know ,moon cakes __________ a symbol of the Mid-Autumn festival, and they____ as gifts rather than a kind of food.
A:are becoming ... use
B:have become ... are used
C:will become ... used to be
D:became ... used as;
B:have become ... are used
C:will become ... used to be
D:became ... used as;
正确答案是:
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