_____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
D
once 意思是 “一旦 ”。while “ 当⋯⋯ 时候 ” ;though“虽然”;unless “除非 ” 。“一旦 你明白了这个规则，处理类似的问题就不困难了。 ”显然， d 符合句子意思的表达需要。
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