A group of frogs were jumping through the woods (when) two o
題目：
A group of frogs were jumping through the woods (when) two of them fell into a deep hole
爲什麼不用Until
解答：
用when是指,當一羣青蛙穿過樹林時,兩隻青蛙掉進了一個深洞.
用until是指,知道兩隻青蛙掉進一個深洞,一羣青蛙才穿過樹林.
題目：
A group of frogs were jumping through the woods (when) two of them fell into a deep hole
爲什麼不用Until
解答：
用when是指,當一羣青蛙穿過樹林時,兩隻青蛙掉進了一個深洞.
用until是指,知道兩隻青蛙掉進一個深洞,一羣青蛙才穿過樹林.
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