______bad weather it is!

     A. How     B. What     C. What a      D. What an

______ bad weather it is!

A. What a B. How C. What　　D. What an

Look at the smog (雾霾). ________ bad weather it is!
A. How            B. What              C. What a

 _____ bad weather it is. It has been raining for two weeks.

      A. What a       B. How a          C. What    D. How