The students didn't manage to work outthe problem ______thei

The students didn't manage to work outthe problem ______their teacher had explained how.
为什么不是unless而是until

LY-TINA 88 1年前已收到3个回答举报

共回答了21个问题采纳率：100% 举报

这句话的意思是直到老师解释了怎么做,学生们才解决了问题.句中用的是完成时,因此用until.unless是除非,表示条件,如果这句话用unless的话就要换成the students can't work out the problem unless their teacher explains how.

1年前

49543036 幼苗

共回答了52个问题举报

前面有not嘛。not....until 是直到....才的意思、这句话说：知道老师解释了怎样做之后他才做出来、用unless就不符合了题意了、
望采纳~

1年前

qingtong 幼苗

共回答了489个问题举报

Until直到
unless除非
根据意思知道
你翻译以下就知道了

1年前

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