问题补充:
A large number of students planting trees now, the number of the students 2000.
A. is, is
B. are, is
C. is, are
D. are, are
答案:
A. is, is
(答案→)B. are, is
C. is, are
D. are, are
解析:考察主谓一致。句意:许多学生正在植树。这些学生的数目是2000.结合语境可知前文a number of表示许多人,主语是复数,故系动词用are。下文the number of……的数目,主语是抽象名词,不可数,故系动词用is。选B。