a
完整语序是The lady falls to the ground when she is crossing the stree 。
条件状语从句，要求前后时态一致。此题为一般时，所以排除d过去完成时，
c一般完成时，第三人称单数谓语动词要加s，所以b错误
when crossing the stree ,the lady __to the ground .
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