As early as 1647 Ohio made a decision that free, tax-supported schools must be established in every town______50 households or m

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问题 As early as 1647 Ohio made a decision that free, tax-supported schools must be established in every town______50 households or more.

选项 A、having
B、to have
C、to have had
D、having had

答案A

解析 本题考查非谓语动词的用法。句意:早在1647年俄亥俄州就做出决定,拥有50或50户以上家庭的每一个镇,都必须建立免费的由税收维持的学校。根据题干可知,“拥有50或50户以上家庭”是一个含有动词的短语,修饰限定“城镇”,这时需要把“拥有”这个动词变为非谓语形式。从形式上看,四个选项都没有问题,但to do sth.作后置定语时表示将要发生的动作,与题意不符,所以排除选项B和选项C。“拥有50或50户以上的家庭”只是对当时事实情况的一种描述,所以应该用一般性时态,选项D为现在完成时态,应排除。故本题选A。
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