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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单项选择题
It's urgent that a meeting ______before the final decision is made.
A．will be arranged
B．must be arranged
C．be arranged
D．would be arranged
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单项选择题
The fact（）he does so in so short period of time challenges explanation.
A．why
B．that
C．what
D．which
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