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    精英家教网 > 高中英语 > 题目详情
    It never _____  humans until the mid­1990s that some animals can be cloned.
    A．occurB．is occurredC．occurred toD．occurred
    C

    试题分析：It occurs to sb that 某人突然想到...，occur to 发生，突然想到。。。句意：直到20世纪中期人类才突然想到克隆出一些动物。
    点评：注意句型的识记。
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