问题补充：
Between the two periods of classes is a break,we can have a short rest.
A. then
B. where
C. when
D. Which
答案：
A. then
B. where
(答案→)C. when
D. Which
解析：此题考察非限制性定语从句。引导词在从句中做时间状语，意义上代替：during a break.
时间：2021-10-20 15:48:26
Between the two periods of classes is a break,we can have a short rest.
A. then
B. where
C. when
D. Which
A. then
B. where
(答案→)C. when
D. Which
解析：此题考察非限制性定语从句。引导词在从句中做时间状语，意义上代替：during a break.
