It last week that the haze(雾霾)in Beijing caused many problems.A. reportsB. reportedC. is

问题补充：

It last week that the haze(雾霾)in Beijing caused many problems.

A. reports

B. reported

C. is reported

D. was reported

答案：

A. reports

B. reported

C. is reported

(答案→)D. was reported

解析：句意：据报道，上周在北京的雾霾引起了许多的问题。结合语境可知本句描述的是过去的状态，主语是动作对象，故用被动语态。选Ｄ。