【題目】Mary is serious about her study. She won't go to bed ________ she finishes all her homework.

A. if B. because C. when D. until

【答案】D

【解析】試題分析：句意：Mary對學(xué)習(xí)很認真，她直到完成作業(yè)才上床睡覺。直到---才是not---until。故選D。

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