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
The news ______ he had landed on the moon spread all over the school campus.
A．which
B．that
C．what
D．as
单项选择题
Once environmental damage______, it takes many years for the system to recover.
A．had done
B．is done
C．is to do
D．does
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