问题补充：
Our class the biggest in Grade Three and our class all crazy about pop music.
A. are; is
B. are; are
C. is; are
D. is; is
答案：
A. are; is
B. are; are
(答案→)C. is; are
D. is; is
解析：考查主谓一致。前文我们班指的是班级，为单数，后面谓语动词也用单数。后面的班级指的班里的同学，表示的复数含义，为谓语动词用复数形式，选C。
