问题描述：
while she was sitting on the beach,a thief took away her bike
while a thief was taking away her bike ,she sat on the beach.
while she was sitting on the beach ,a thief was taking away her bike
这三句话哪句是正确的,为什么,
while a thief was taking away her bike ,she sat on the beach.
while she was sitting on the beach ,a thief was taking away her bike
这三句话哪句是正确的,为什么,
问题解答：
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