单项选择题

64（）

A．provide
B．offer
C．buy
D．pay

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单项选择题
______ for your help, we'd never have been able to get over the difficulties.
A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
单项选择题
61（）

A．Central
B．Federal
C．Official
D．Public
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