问题描述：
-How long are you staying?
-I don't know._____
A.That,s OK B.Never mind C.It depends D.It doesn't matter
为什么不选D呢?
-I don't know._____
A.That,s OK B.Never mind C.It depends D.It doesn't matter
为什么不选D呢?
问题解答：
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