问题
选择题
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
答案：D
题目分析：句意：--上周据报道北京雾霾引起了很多问题。it it reported 据报道.... 因为有 last week所以要用一般过去时。故选D.