A lot of companies ______ a shortage of skilled staff.

A lot of companies ______ a shortage of skilled staff.
A、suffer from
B、suffered from
C、are suffering
D、are suffering from
【正确答案】:D
【题目解析】:动词短语suffer from(因疾病、痛苦、悲伤等)受苦、受难、受折磨。