hardworking students they are!A. WhatB. What aC. What anD. How

问题补充：

hardworking students they are!

A. What

B. What a

C. What an

D. How

答案：

(答案→)A. What

B. What a

C. What an

D. How

解析：考查感叹句。名词用What引导，题中的名词是复数students，所以用What，句意：他们是多么勤劳的学生呀！