单项选择题


A．made from
B．made of
C．make from
D．make of
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单项选择题
A．was usedB．usedC．is usedD．are used
A．was used
B．used
C．is used
D．are used
单项选择题
A．was discoveredB．was inventedC．discoveredD．invented
A．was discovered
B．was invented
C．discovered
D．invented
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