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
His father was an under-paid worker, ______ hard life turned him into a rebel.
A．whose
B．which
C．of whose
D．of which
单项选择题
______ makes mistakes must correct them.
A．What
B．That
C．Whoever
D．Whatever
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