问题补充：
The class big. Now the class practicing swimming.
A. are ;are
B. is ;is
C. is ; are
D. are ; is
答案：
A. are ;are
(答案→)B. is ;is
C. is ; are
D. are ; is
解析：考查主谓一致：句中第一个class指的是班级这个整体，属于单数名词，故用is；第二个class指的是班上的同学，为复数，故用are。
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