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She remembered several occasions in the past __ she had expe

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She remembered several occasions in the past __ she had experienced a similar feeling.
[A] while [B] before [C] that [D] when
.不太看得懂下面的解释呃..
D 这道题考查的是定语从句的引导词
空格往后做得是先行词occasions的定语 即她经历类似感觉的场合
定语从句中不缺少名词性成分(主语或者宾语)是完整的句子 所以应该用关系副词
CD最显著的区别在于C为关系代词 D为关系副词 希望我讲明白了