The school shop, customers are mainly students, is closed during class time.
A. which
B. where
C. whose
D. when
网友回答
A. which
B. where
(答案→)C. whose
D. when
解析：句意：学校的商店在上课期间是关闭的，它的顾客主要是学生。首先主语the school shop为sth，并无代表时间及地点的介词，所以排除B、D，原句主要表达的是超市的顾客而不是在超市所以用whose，相当于原句the school shop's customers are mainly students.。故选C。
考点: 考查定语从句的用法。