问题
选择题
In 1831, Faraday discovered that electricity moves through a wire ________ a magnet（磁铁） is moved near the wire.
A．where
B．so
C．when
D．but
答案
答案：C
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In 1831, Faraday discovered that electricity moves through a wire ________ a magnet（磁铁） is moved near the wire.
A．where
B．so
C．when
D．but
答案：C