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【题目】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释清楚了他将如何花费才给他零用钱。until引导时间状语从句,用一般现在时或现在完成时表将来。

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