问题描述：
before doing与before do
What do you do to the prawns before you_____them?
A.frozen.B .froze.C.freeze.D.freezing
求解答〜〜〜
What do you do to the prawns before you_____them?
A.frozen.B .froze.C.freeze.D.freezing
求解答〜〜〜
问题解答：
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