因为它是错的
正确的应该是A,只有一种情况上下文为其它时态时,从句或者主句仍可用现在时态或者现在进行时,那就是叙述的是绝对真理,类似于地球是圆的,地球围着太阳转等
这里的从句是说明祸发生的时间,所以有同时进行的意思,用过去进行时比较好,而且b happening语法不对,c 也是语法问题,前后时态对不上,d也是语法错误
The traffic accident ___ when I ___ past the supermarket.
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