_____you understand this rule,you.ll have no difficulty in dealing with such problems.　 (A) While (B) Though (C) Unless (D) Once

_____you understand this rule,you.ll have no difficulty in dealing with such problems.　
(A) While
(B) Though
(C) Unless
(D) Once

出自：郑州工程技术学院-建筑CAD

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