单项选择题

A．of
B．in
C．on
D．/
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单项选择题
A．happenedB．occurredC．appearedD．shown
A．happened
B．occurred
C．appeared
D．shown
单项选择题
A．isolatedB．integralC．connectedD．related
A．isolated
B．integral
C．connected
D．related
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