问题描述：
– He promised to come to see you.
- But he _______ .I've been alone.
A doesn't B didn't C won't D hasn't
这里答案是选D 我想问 B D与B有什么区别?
- But he _______ .I've been alone.
A doesn't B didn't C won't D hasn't
这里答案是选D 我想问 B D与B有什么区别?
问题解答：
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