单项选择题


A．which
B．that
C．where
D．when
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单项选择题
A．known ofB．known asC．knowing asD．known
A．known of
B．known as
C．knowing as
D．known
单项选择题
A．electricB．electricalC．electronicD．electronics
A．electric
B．electrical
C．electronic
D．electronics
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