your homework ( ) by the time i come backA is to being domeB is doneC is to been done D is to be done

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yourhomework()bythetimeicomebackAistobeingdomeBisdoneCistobeendoneDistobedoneyourhomework()bythetime

your homework ( ) by the time i come backA is to being domeB is doneC is to been done D is to be done
your homework ( ) by the time i come back
A is to being dome
B is done
C is to been done
D is to be done

your homework ( ) by the time i come backA is to being domeB is doneC is to been done D is to be done
选择D is to be done
先说初中阶段涉及到的六种时代的被动语态：
一般现在时：is done
一般过去时：was done
一般将来时：will be done; am/is/are going to be done; is to be done
现在进行时：am/is/are being done
过去进行时：was/were being done
现在完成时：have/has been done
所以先排除选项A is to being dome 和C is to been done.
再看题目by the time I come back,是表示将来的时间,因为是时间状语从句,所以用一般现在时.
所以主句应该用一般将来时,只能选择D is to be done.
意思是：到我回来的时候,你的作业要做完.

A
当我回来的时候，你正在完成作业
我回来时一个瞬间发生的，所以应该用现在进行时
~~这种题不好解释啊，应该靠语感了~

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