At school some students are active some are shy yet they can be good friends with one an

问题补充：

At school, some students are active some are shy, yet they can be good friends with one another.

A. although

B. while

C. so

D. as

答案：

A. although

(答案→)B. while

C. so

D. as

解析：考查连词辨析。A尽管；B当…时；然而；尽管；C于是；D随着；句意：在学校里，有一些学生很积极，然而也有一些很害羞，可是他们都可能成为好朋友。故B正确。