_____JohnwonagoldmedalintheEnglishcompetitionreallyexcitedhisfamily.A.

_____ John won a gold medal in the English competition really excited his family.A.ThatB.when C.whichD.what

A解析试题分析：考查主语从句。本题中的that引导主语从句that John won a gold medal in the English competition.在句中that不充当任何成分，只起引导和连接作用。句意：John在英语比赛中赢得了金牌这件事情让他的家人很高兴。BC两项都有疑问的意思，what要在句中充当一定的句子成分。故A正确。考点：考查主语从句点评：在复合句中做主语的从句叫做主语从句，它的位置与陈述句基本结构中的主语相同。引导主语从句的关联词有：连词：that, whether；连接代词：who, whom, whose, what, which；连接副词：when, where, why, how；复合词：whatever, whoever, whomever, when?蛳ever, wherever, whichever, however.解答这类题目，关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分及意义，来选择正确的引导词。

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