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．ItB．ThereC．ThisD．Which
A．It
B．There
C．This
D．Which
单项选择题
A．mixing withB．mixed withC．was mixing withD．was mixed with
A．mixing with
B．mixed with
C．was mixing with
D．was mixed with
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