He will never forget the day ________ he spent with his students.
A.when B.which
C.during which D.on which
He will never forget the day ________ he spent with his students.
A.when B.which
C.during which D.on which
解析:分析句子结构可知,所填词引导一个定语从句,修饰先行词the day,并在从句中作spent的宾语,故选项B正确。
答案:B