单项选择题

In fact he had done______ he could do to help the poor.

A．what
B．which
C．as
D．all which
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单项选择题
The new English dictionary I bought yesterday______ me almost twenty yuan.
A．spent
B．paid
C．cost
D．took
单项选择题
The United States is composed of fifty states, two of ______are separated from the others by land or water.
A．them
B．that
C．which
D．those
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