【題目】Willie's wife never gives him pocket money until he __________ clearly how he will spend it.

A. has explained B. explained

C. will explain D. is to explain

【答案】A

【解析】句意：威利的妻子直到他解釋清楚了他將如何花費才給他零用錢。until引導時間狀語從句，用一般現(xiàn)在時或現(xiàn)在完成時表將來。

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