Look, _____ students _____ playing basketball on the playground.
- A.the number of, are
- B.a number of, is
- C.the number of; is
- D.a number of; are
答案
正确答案:D

a number of students 表示许多学生,后面谓语动词用复数;the number of students 表示学生的数量,后面谓语动词用单数。

区分不清 a number of 和 the number of 的意思,谓语动词单复数容易记混。
