This suit is rather dirty now. It is some time since it (wash) ______.

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问题 This suit is rather dirty now. It is some time since it (wash) ______.

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答案was washed

解析 在这里,since是连词,译成“自从”,引导时间状语从句。当从句用一般过去时时,主句一般用现在完成时或一般现在时。
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