单项选择题

It is vital that you()quickly to whatever is said.

A．respond
B．responded
C．will respond
D．are responding

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单项选择题

()breaks the law will be punished sooner or later.

A．Who
B．Whoever
C．Anyone
D．Someone

单项选择题

Our department has a large collection of books()are in English.

A．many of which
B．many of them
C．many ones
D．their many

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