问题描述：
I don’t know _________.Can you tell me?A.
I don’t know _________.Can you tell me?A.what to do B.what should I do C.how to do D.what to do it 为什么答案是A,为什么B是错误的?
I don’t know _________.Can you tell me?A.what to do B.what should I do C.how to do D.what to do it 为什么答案是A,为什么B是错误的?
问题解答：
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