a.What were you doing when it rained.b.What were you doing while it was raining.

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a.What were you doing when it rained.b.What were you doing while it was raining.

a.What were you doing when it rained.b.What were you doing while it was raining.
a.What were you doing when it rained.b.What were you doing while it was raining.

a.What were you doing when it rained.b.What were you doing while it was raining.
两个句子都对.第一句用 when it rained 只是表示“当下雨的时候”,第二句用 while it was raining 强调在下雨进行的时候.

b
a的语义不通。