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

試題分析：考查連詞：A. if如果B. until直到C. when當…時候，D. unless除非，這里考查的是not…until…句型，句意：直到媽媽的腿好起來，醫(yī)生才讓她起床，選B。
點評：連詞的詞義辨析要放在上下文的語境中進行，要注意上下文的語義的串聯(lián)以及邏輯關(guān)系的推理，特別要注意一些連詞和時間狀語的固定搭配。
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