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

admin2009-09-15  42

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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