_______l felt would solve this problem ,l never thought would be so difficultA.While B.Once C.If D.Until

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_______lfeltwouldsolvethisproblem,lneverthoughtwouldbesodifficultA.WhileB.OnceC.IfD.Until_______lfel

_______l felt would solve this problem ,l never thought would be so difficultA.While B.Once C.If D.Until
_______l felt would solve this problem ,l never thought would be so difficult
A.While B.Once C.If D.Until

_______l felt would solve this problem ,l never thought would be so difficultA.While B.Once C.If D.Until
A.While 尽管 前半部分是不是打错了?