Pleasant music is often playedclasses to make students refreshed and relaxed for a while.A

问题补充：

Pleasant music is often playedclasses to make students refreshed and relaxed for a while.

A. between

B. among

C. over

D. after

答案：

(答案→)A. between

B. among

C. over

D. after

解析：考查介词的用法。在课间，应使用介词between。