A number of students reading in the classroom now.A. isB. wasC. areD. were

问题补充：

A number of students reading in the classroom now.

A. is

B. was

C. are

D. were

答案：

A. is

B. was

(答案→)C. are

D. were

解析：C 考查a number of和the number of的区别，前者意为“许多”，与many等同；后者意为“......的数量”，谓语用单数。“现在有很多学生在教室里读书。”故选C。