单项选择题
Sometimes children have trouble ______ fact from fiction and may believe that such things actually exist.
A．to separate
B．separating
C．for separating
D．of separating
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单项选择题
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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单项选择题
If tap water were as dangerous as some people think,______ would be getting sick.
A．a lot of more us
B．more a lot of us
C．a lot of us more
D．a lot more of us
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