单项选择题

Small incomes have brought down the birth ______.

A．ratio
B．speed
C．interest
D．rate
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单项选择题
He had understood nothing ______ to understand.
A．neither he had sought
B．nor had he sought
C．and he had neither sought
D．and nor he had sought
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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