The teacher said he needed boys besides his students the classroom.
A. 20 other; clean
B. 20 more; to clean
C. 20 more; cleaning
D. another 20; clean
网友回答
A. 20 other; clean
(答案→)B. 20 more; to clean
C. 20 more; cleaning
D. another 20; clean
解析： another 20 students = 20 students more； 后面是不定式作目的状语。