Students are required to go out in couples, especially in the evenings, with friends they get into trouble．
A. even if
B. if only
C. in case
D. when
网友回答
A. even if
B. if only
(答案→)C. in case
D. when
解析：
这题考查连词的用法：even if即使， if only但愿，in case以防，when当…时候，句意是：学生被要求成对和朋友外出，尤其在晚上，以防有麻烦。选C。