作业帮一道英语选择题：I didn't manage to do it ____ you had explained how.I didn't manage to do it ____ you had explained how.A untilB unlessC when D before并解释一下其他选项不选的原因.
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一道英语选择题：I didn't manage to do it ____ you had explained how.I didn't manage to do it ____ you had explained how.A untilB unlessC when D before并解释一下其他选项不选的原因.
一道英语选择题：I didn't manage to do it ____ you had explained how.
I didn't manage to do it ____ you had explained how.
A until
B unless
C when
D before
并解释一下其他选项不选的原因.
一道英语选择题：I didn't manage to do it ____ you had explained how.I didn't manage to do it ____ you had explained how.A untilB unlessC when D before并解释一下其他选项不选的原因.
until
意为直到
我不会决定去做直到你说出为什么这么做
unless是除非,unless后不跟完成时
when是用于疑问句
before与句意就不符合了,不信自己翻译试试,哈哈
选A
意为直到你教我后，我才会做。
他用了过去完成时，所以不选其他的
A until.
选项2不对因为unless的意思是除非
首先应想到not....until...为固定搭配，意为直到....才.....初步确定答案。
从句子意思上理直到你解释如何去做之后，我才做成这件事。
manage to do sth 意为 成功做成某事。
unless意为除非，意思不符，句子语态也不符。
when意为当 明显不合逻辑
before 意为在.....之前，不能与句子前的否定式not构成直到....
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首先应想到not....until...为固定搭配，意为直到....才.....初步确定答案。
从句子意思上理直到你解释如何去做之后，我才做成这件事。
manage to do sth 意为 成功做成某事。
unless意为除非，意思不符，句子语态也不符。
when意为当 明显不合逻辑
before 意为在.....之前，不能与句子前的否定式not构成直到...才...的意思。
故选until（固定搭配，句子通顺，复合逻辑）
收起
unless是除非，unless后不跟完成时
when：当。。。时候 也用在be doing。。。when。。。be about to do...when...意思是“突然”
before与句意 不符
manage to do sth=succuceed in doing sth 是成功做了某事
所以翻译成 ：直到你解释了怎么做 我才做成。