Students continue to eat in school canteen they plain the quality of the food .
A. as though
B. even though
C. as long as
D. unless
网友回答
A. as though
(答案→)B. even though
C. as long as
D. unless
解析：考查连词：A. as though 好像B. even though即使C. as long as 只要D. unless除非，句意：学生继续在学校餐厅吃饭，即使他们抱怨食物的质量。选B。