Agoodidea________tome.A.occurre

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A解析考查动词的习惯用法。occur是不及物动词，构成以下结构：sth occurs /occurred to sb 某人想起某事It occurs to so mat... 某人想起某事如：It occurred to me that I would buy a book.我突然想起要买本书。由此可知A正确。