单项选择题

Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.

A．people have
B．since people have
C．have people
D．people who have
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单项选择题
I'd just as soon ______ rudely to her.
A．you not speak
B．your not speaking
C．you didn't speak
D．you hadn't spoken
单项选择题
Only when you have obtained sufficient data ______ come to a sound conclusion.
A．can you
B．you can
C．would you
D．you would
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