______ 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…”。

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