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单选题
It is common practice ______ a battery when it still has some life in it.
A

to charge

B

charge

C

charged

D

having charged


参考答案

参考解析
解析:
本题考查固定句型。句意:当电池还有一些电的时候进行充电是很普遍的行为。It is +名词短语+不定式为固定搭配句型,此外,本句中“it”是形式主语,真正的主语是动词不定式。故A项为正确答案。
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