【_______lfeltwouldsolvethisproblem,lneverthoughtwouldbesodifficultA.WhileB.OnceC.IfD.Until】
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题目内容：
_______l felt would solve this problem ,l never thought would be so difficult
A.While B.Once C.If D.Until
优质解答
A.While 尽管 前半部分是不是打错了?
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