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    you understand this rule, you’ll have no further difficulty.
A.UntilB.UnlessC.ThoughD.Once
D

试题分析:考查连词:A. Until直到,B. Unless除非,C. Though虽然,D. Once一旦,句意是:一旦你理解了规则,你就不再有困难了。选D。
点评:连词的考查在于辨别不同的连词含义,在做题时注意上下文的逻辑关系。
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