______ you understand this rule, you’ll have no further difficulty.

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问题 ______ you understand this rule, you’ll have no further difficulty.

选项 A、Once
B、Unless
C、Only
D、Until

答案A

解析 Once意为“一旦…”;Unless意为“如果不;除非”;Only意为“只有”;Until意为“直到…才…”。根据本句句意:一旦你理解了这条规则,你就会没有下—步的困难。故本题答案为A。
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