________ useful subject English is!We must learn it well.

问题描述:

________ useful subject English is!We must learn it well.
A:What an
B:What a
C:What
D:How

B:What a
1.what +(a /an )+名词+主语+谓语
how+形容词/副词+主语+谓语
2.useful 辅音开头用a