I don’t know what of students in that school is but you can see there are of bikes and

问题补充：

I don’t know what of students in that school is, but you can see there are of bikes and e-bikes outside the gate.

A. a number, the number

B. a number, a number

C. the number, a number

D. the number, the number

答案：

A. a number, the number

B. a number, a number

(答案→)C. the number, a number

D. the number, the number

解析：the number of 表示…数字，a number of 表示大量的，故选C