January 1st, 1937, is the historic date when Britain (join) ______ the Common Market.

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问题 January 1st, 1937, is the historic date when Britain (join) ______ the Common Market.

选项

答案joined

解析 在由关系副词when引导的定语从句中.从句的时态应和表示时间的先行词保持一致。在本句中, the historic date指的是January 1st,1937,这是个表示过去时间的状语,所以用一般过去时。
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