2. 外语
  3. Primary batteries or cells are _______ , once discharged, are discarded.

Primary batteries or cells are _______ , once discharged, are discarded.

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问题 Primary batteries or cells are _______ , once discharged, are discarded.
选项 A、those
B、those that
C、that
D、that they
答案B
解析 指示代词指代复数名词词组：“primary batteries or cells”。
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