A(Lost in thought) she B(didnt hear) the thunder C(to begin) in the mountains D(far off).

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A(Lost in thought), she B(didnt hear) the thunder C(to begin) in the mountains D(far off).

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗