I didn't _____it until you had explain how.

I didn't _____it until you had explain how.
A manage to do B manage to have done 选哪个请说明理由.顺便说一下不定时什么时候一定要用完成时?

zhou827 1年前已收到4个回答举报

wetyeruetertr 幼苗

共回答了17个问题采纳率：100% 举报

选B
had explained是过去完成时,此动作在didn't manage to 之前,完成时的前一个时态是什么?就是现在完成时,所以选B.

1年前

悠悠见南山幼苗

共回答了126个问题举报

选A,主句时态和从句时态相呼应的主句用的是过去时态didn't manage to do ，从句用的是had explain 说明从句动作发生在主句动作之前，to do 作manage的宾语尽力去做，既然尽力、设法，说明“做”的动作还没有完成，所以用to have done 解释不通。

1年前

艰苦辉钴矿幼苗

共回答了420个问题举报

B 看句子，这句话后面说直到你had explained，所以肯定要用完成时~~

1年前

lishengxia 幼苗

共回答了1个问题举报

如ren 12345 所解释的

1年前

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