of the students who took part in the military training is 450.A. A numberB. A lotC. A few

问题补充：

of the students who took part in the military training is 450.

A. A number

B. A lot

C. A few

D. The number

答案：

A. A number

B. A lot

C. A few

(答案→)D. The number

解析：考查主谓一致：根据后面的谓语is，可以判断选the number，因为the number of+可数名词的复数“…的数量”，谓语是单数形式，A. A number of+可数名词复数，谓语是复数，B.a lot of+可数名词复数，谓语是复数,C项，a few后面不加of，选D。