问题补充：
Our foreign English teacher Shirley has a gift for creating an atmosphere for her students allows them to communicate freely with each other.
A. which
B. where
C. what
D. who
答案：
(答案→)A. which
B. where
C. what
D. who
解析：本题是一个非限制性定语从句,which指代前面一句话的内容，在句中做主语。句意：我们的外教有一种为他的学生创造出很好的氛围的天赋，这让学生们可以自由地相互交流。Where在句中只能做状语，what不能引导定语从句；who的先行词只能是人。故A正确。
