A-A+
________you understand this rule you'll have
问题详情
________you understand this rule, you"ll have no further difficulty.
[A]Once
[B]Unless
[C]Only
[D]Until请帮忙给出正确答案和分析,谢谢!
参考答案
正确答案:A
27.A【解析】本题考查连词的用法。once意为“一旦…”;unless意为“如果不;除非”;only意为“只有”;until意为“直到…才…”。