to gain access to seats at college the seniors are working hard．
A. That is；\
B. It is；that
C. What is；that
D. Which is；why
网友回答
A. That is；\
(答案→)B. It is；that
C. What is；that
D. Which is；why
解析：考查强调句式。强调句的特点是去掉it is/was ……that后，句子完整。本句去掉强调句后为，The seniors are working hard to gain access to seats at college. 句子完整。