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A group of frogs were jumping through the woods (when) two of them fell into a deep hole
为什么不用Until
人气:316 ℃ 时间:2020-01-27 09:28:19
解答
用when是指,当一群青蛙穿过树林时,两只青蛙掉进了一个深洞.
用until是指,知道两只青蛙掉进一个深洞,一群青蛙才穿过树林.
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