问题补充:
difficult questions they are! I can’t answer them.
A. How
B. How a
C. What
D. What a
答案:
A. How
B. How a
(答案→)C. What
D. What a
解析:句意:他们是多么难的问题呀!我不会回答它们。感叹句一般有两种结构:what +(a/an)+形容词+名词+主语+谓语!名词是复数或不可数名词,不加a/an.how+形容词+主语+谓语!questions复数,所以根据感叹句的结构选C