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after he woke up,he found himself____ by a group of young vi

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after he woke up,he found himself____ by a group of young villagers.
A.being surrounding B.surrouding C.surrounded D.being surrounded选了C,但是另一题:when he awoke,he found himself______ by an old woman.
A.being surrounding B.surrouding C.surrounded D.being surrounded却选了D,为什么不一样?
when是当...时候 有一个正在发生的意思
after是已经过去了 不可能正在发生了
所以前者用过去式
后者用进行时