delicious the roast beef is !A. WhatB. HowC. What aD. How a

问题补充：

delicious the roast beef is !

A. What

B. How

C. What a

D. How a

答案：

A. What

(答案→)B. How

C. What a

D. How a

解析：句意：烤牛肉真美味啊！how引导感叹句用来修饰名词或副词，how+形容词+主语+谓语；what用来修饰名词；what+a/an+形容词+可数名词名词+主谓；或者是what+形容词+不可数名词+主谓；结合语境故选B。