Therearesomanyfoggydaysrecently,weallwonder

问题详情：

There are so many foggy days recently, we all wonder_________.

A. how is the air polluted

B. why the air is seriously polluted

C. what can we do to prevent that bad weather

D. what are the real reasons

【回答】

B

知识点：宾语从句

题型：选择题