Question

— Do you know about the Japanese nuclear crisis(核危机)?

— Yes. I know           .

1. A.
   how are they dealing with it
2. B.
   what it has caused
3. C.
   how terrible was it
4. D.
   how long will it last

Answer 1

B
本题know后跟的是一个宾语从句，应该用陈述顺序，故选B,ACD都是疑问顺序。