（）you understand this rule,you.ll have no difficulty in dealing with such problems. (本题3.5分) A、 While B、 Though C、 Unless D、 Once

（）you understand this rule,you.ll have no difficulty in dealing with such problems. (本题3.5分)
A、 While
B、 Though
C、 Unless
D、 Once

出自：赤峰学院-综合英语I(专升本)

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