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— How did the accident happen?
— You know, it        difficult to see the road clearly because it      .

---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?

— You know, it        difficult to see the road clearly because it      .

A．is…was raining     B．was…h(huán)ad rained    C．is…is raining       D．was…was raining