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  3. When ______ through a circuit, the current will lose part of its energy.

When ______ through a circuit, the current will lose part of its energy.

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问题 When ______ through a circuit, the current will lose part of its energy.
选项 A、flowing
B、being flowed
C、flowed
D、having flown
答案A
解析 从句和主句为同一个主语“the current”，故用-ing形式。
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