Inthepastseveralweeks,manycitiesinNorthernChina_______...

问题详情：

 In the past several weeks, many cities in Northern China _______ from heavy fogs and severe cold, causing great inconvenience to people.

A. suffered       B. have been suffering    C. were suffered   D. had been suffered

【回答】

B

知识点：现在完成进行时及其被动式

题型：选择题