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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本试题收录于: 英语题库普高专升本分类
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