the students are doing their maths exercises with the help of the teacher.A. Three score

问题补充：

the students are doing their maths exercises with the help of the teacher.

A. Three score of

B. Three scores

C. Score of

D. Scores

答案：

(答案→)A. Three score of

B. Three scores

C. Score of

D. Scores

解析：可联系答.案.网客服索取。