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答案是c但是not和unless只见没有标点,不就成了双从否定了?不除非你已经完成作业?—Mum.CouldIjoinyouinthegame?—Sorry,not————youhavefinishedyourhomework.A.ifB.sinceC.unlessD.until

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答案是c但是not 和 unless只见没有标点,不就成了双从否定了?不除非你已经完成作业?
— Mum.Could I join you in the game?— Sorry,not ———— you have finished your homework.
A.if B.since C.unless D.until
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答案和解析
其实它是省略了,完整的是sorry,you couldn't join me unless you have finished your homework.