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The doctor will not permit mother up __________ her leg is better.
A.ifB.untilC.whenD.unless
B

试题分析:考查连词:A. if如果B. until直到C. when当…时候,D. unless除非,这里考查的是not…until…句型,句意:直到妈妈的腿好起来,医生才让她起床,选B。
点评:连词的词义辨析要放在上下文的语境中进行,要注意上下文的语义的串联以及逻辑关系的推理,特别要注意一些连词和时间状语的固定搭配。
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