— How did the accident happen?

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

A．is…was raining

B．was…had rained

C．is…is raining

D．was…was raining

结核病宣传的核心信息包括症状、传播途径和（）

A.咳嗽

B.痰涂片

C.得了结核病应到专门机构接受正确治疗

D.养成良好的卫生习惯

E.按时接种卡介苗