The number of the people in the room sixty, but a number of them students.
A. was, was
B. was, were
C. were, were
D. were, was
网友回答
A. was, was
(答案→)B. was, were
C. were, were
D. were, was
解析：考查主谓一致。The number of…的数量，做主语的时候，后面使用单数形式。A number of许多，修饰可数名词复数形式，做主语谓语动词用复数形式，故B正确。