It is common practice______a battery when it still has some life in it.A、to char

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

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

答案 A

解析 it经常在句中作形式主语，真正主语通常为that引导的主语从句或动词不定式结构，所以选项A)为本题的正确答案。

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