The number of students in our school 4000 and a number of them good at playing ping pong.
A. is, is
B. are, are
C. is, are
D. are, is
网友回答
A. is, is
B. are, are
(答案→)C. is, are
D. are, is
解析：我们学校学生的数目是4000，他们中许多人擅长打乒乓球。结合语境可知前文number表示数字，故be动词用单数。下文a number of them表达复数含义，故系动词用复数。选C。