----What the number of the students in your school?-- About two thousand. A number of

问题补充：

----What the number of the students in your school?

---- About two thousand. A number of them from America.

A. is; are

B. is; is

C. are; is

D. are; are

答案：

(答案→)A. is; are

B. is; is

C. are; is

D. are; are

解析：句意：你们学校的学生数是多少？大约两千。其中许多来自美国。The number of …的数目，作主语时，谓语动词用第三人称单数形式。A number of 许多，作定语修饰名词或代词。