Students continue to eat in school canteen______ they plain the quality of the food .A.as thoughB.even thoughC.as long asD.unless
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B解析试题分析：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。考点：考查连词短语
点评：这几个词都是连词短语，要分清每个连词短语的含义和用法，做题时关键看上下文和句意的逻辑关系做题。