We are considering the students' request the school canteen should provide more kinds of food especially during the weekends．
A. that
B. when
C. which
D. where
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(答案→)A. that
B. when
C. which
D. where
解析：考查同位语从句：同位词是the students' request，同位语从句是对the students' request的内容进行说明，同位语从句是完整的，不缺成分，用that连接，句意：我们在考虑学生的要求，学生餐厅应该提供更多品种的食品尤其在周末。选A。