单项选择题

A．experimenting with
B．experimenting on
C．experimented with
D．experimented on
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单项选择题
A．dueB．blamedC．causedD．responsible
A．due
B．blamed
C．caused
D．responsible
单项选择题
A．splitB．scarC．woundD．damage
A．split
B．scar
C．wound
D．damage
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