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--How did the accident happen?

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--How did the accident happen?
---You know,it ( ) difficult to see the road clearly because it ( ).
A.was,was raining
B.is,has rained
C.is,is raining
D.will be,will rain
--How did the accident happen?
因为跟据语气可以判断是过去时,而看不清路面是因为正在下雨,所以第二个空应该用过去进行时.