of the students who took part in the military training is 750.A. A numberB. A lotC. Doze

问题补充：

of the students who took part in the military training is 750.

A. A number

B. A lot

C. Dozens

D. The number

答案：

A. A number

B. A lot

C. Dozens

(答案→)D. The number

解析：考查主谓一致：ABC三个选项都可以接of，表示许多，但如果选它们，后面的谓语应该是复数，而这句话的谓语是单数，用the number of…,“…的数量”后面的谓语是单数，句意：参加军事训练的学生的数量是750.选D。