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
() we have finished the course, we shall take a new one.

A．Since now
B．Since that
C．Now that
D．By now
单项选择题
() breaks the law will be punished sooner or later.

A．Who
B．Whoever
C．Anyone
D．Someone
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