题目内容
【题目】Linda is doing her homework ________ her brother is watching TV.
A. until B. if C. because D. while
【答案】D
【解析】句意：琳达在做作业，而她弟弟在看电视。A. until 直到； B. if 如果，是否； C. because因为； D. while当---时候，而；此处Linda is doing her homework 和her brother is watching TV.暗含对比，应该用while；故选D
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