单项选择题

Joy was sad because his pet cat______.

A．was died
B．had been dead
C．had died
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单项选择题
Nobody should______.
A．laugh at
B．be laughed
C．be laughed at
单项选择题
He______ to eat as much as he does now.
A．usedn't
B．not used
C．did used not
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