问题描述：
-What are you going to do this winter holiday?
-I ____ yet.
A.don't decide B.didn't decide
C.haven't decided D.won't decide
C 为什么其它3个不行?
-I ____ yet.
A.don't decide B.didn't decide
C.haven't decided D.won't decide
C 为什么其它3个不行?
问题解答：
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