At school some students are activesome are shy yet they can be good friendswith one anot

问题补充：

At school, some students are activesome are shy, yet they can be good friends

with one another.

A. while

B. although

C. so

D. as

答案：

(答案→)A. while

B. although

C. so

D. as

解析：考查连词：A. so那么B. although虽然C. while然而D. as当…时候，因为，句意：在我们学校，一些学生很积极，而一些人很害羞，然而他们可以成为很好的朋友。选A。