题目内容
__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once |
| C．Though | D．Unless |
B
解析试题分析：A. While当…时候，虽然，然而，B. Once一旦， C. Though虽然，D. Unless除非，句意：一旦你理解了规则，你就不会有困难了。根据句意选B。
考点：考查连词
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