单项选择题


A．in
B．on
C．for
D．from
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单项选择题
A．was discoveredB．was inventedC．discoveredD．invented
A．was discovered
B．was invented
C．discovered
D．invented
单项选择题
A．look forB．look inC．look afterD．look through
A．look for
B．look in
C．look after
D．look through
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