William promised to ____________ (不是周五就是周六之前向导师呈交论文).submit the paper to his tut

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问题 William promised to ____________ (不是周五就是周六之前向导师呈交论文).

选项

答案 submit the paper to his tutor either by Friday or by Saturday

解析 “不是…就是…”采用either．．．or．．．连词词组。

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