The game is not very difficult you understand the rules.A. until B. thoughC. once D. unless

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【题目】The game is not very difficult _______ you understand the rules.

A. until B. though

C. once D. unless

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【答案】C

【解析】

考查条件状语从句。A. until直到---为止；B. though尽管；C. once一旦；D. unless除非。句意：一旦你明白了规则，这个游戏就不难了。此处是once“一旦”引导的条件状语从句，故选C。