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 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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