January 1st, 1997, is the historic date when Britain(join)______ the Common Mark

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问题 January 1st, 1997, is the historic date when Britain(join)______ the Common Market.

选项

答案 joined

解析 “when”引导的是一个定语从句，需要一个谓语动词，主句用的是“is”，而此句的时间是过去的一个具体时间，所以“when”引导的从句要用一般过去时表示。

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