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  3. Primary batteries of cells are those that, once ______, are discarded.

Primary batteries of cells are those that, once ______, are discarded.

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问题 Primary batteries of cells are those that, once ______, are discarded.
选项 A、to be discharged
B、being discharged
C、discharged
D、discharging
答案C
解析 本题为语法结构题，考分词结构。过去分词短语 once discharged 表示被动，相当于从句 once they are discharged，用作状语。本句大意为：最初的电池放电之后就被丢弃了。
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