As early as 1647 Ohio made a decision that free, tax-supported schools must be established in every town __________ 50 households or more.

A．having

B．to have

C．to have had

D．having had

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参考答案

答案解析

本题考查非谓语动词的用法。现在分词短语having 50 households or more作town的定语，因为town和have之间是主动关系。不定式作定语在时间上一般表示将来，所以不能选不定式。句意：早在1647年，俄亥俄州就做出决定，每个拥有50或50个以上家庭的城镇都应该建立免费的公立学校。

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