The number of students in our school about 30 000 and them study hard.
A. is;a large amount of
B. are;a number of
C. is;large amount of
D. is;a large number of
网友回答
A. is;a large amount of
B. are;a number of
C. is;large amount of
(答案→)D. is;a large number of
解析：the number of+复数名词，意为“……的数目”。作主语时，谓语动词用单数；a number of+复数名词。句意为：我们学校的学生数为30 000，并且大多数人学习努力。