题干
At school, some students are active ________ some are shy, yet they can be friends with one another.
A：while
B：although
C：since
答案(点此获取答案解析）
A
At school, some students are active ________ some are shy, yet they can be friends with one another.
A：while
B：although
C：since
关叙述，正确的是（ ）