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9.The law of gravitywas discovered (discover) by Isaac Newton about 350years ago.

分析 万有引力定律大约在350年前由艾萨克牛顿发现的.

解答 答案:was discovered.主语是The law of gravity是动词discover"发现"的承受者,构成被动关系,时间状语about 350years ago表示350年前,故用一般过去时的被动语态was/were+过去分词,主语是三单,故was,discover的过去分词discovered,故答案是was discovered.

点评 一般过去时的被动语态was/were+过去分词的呈现,各种时态的被动语态的构成要理解记忆.

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