单项选择题

______，John would have told you about it． 　

A．If he has known it　
B．Had he known it 　　
C．If he knew it 　　　
D．Should he know it
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单项选择题
How pleased the detective was______what his customer told him．
A．hearing　
B．hear　
C．heard　
D．to hear
单项选择题
Do you often______until tomorrow what you should do today
A．put away　
B．put down　
C．put up
D．put off
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