题目内容
You will find the game is not so difficult to play ______ you understand its rules.
| A．until | B．since | C．before | D．once |
D
解析试题分析：考查状语从句。句意：一旦理解了比赛规则，你就会发现这个比赛并不难。A直到；B自从；C在......之前；D一旦。选A的话，意为“直到理解了规则才发现它很难”，不符合题意。故选D。
考点：考查状语从句
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