It is common practice______a battery when it still has some power in it.

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问题 It is common practice______a battery when it still has some power in it.

选项 A、to charge
B、charge
C、charged
D、having charged

答案A

解析 “It is／was+名词+to do sth．”为固定句型，其中It是句子的形式主语，真正的主语是不定式，意为“做……是……”。故选A。

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