2. 外语
  3. An ionizing smoke detector contains a chamber______a low electric current flows.

An ionizing smoke detector contains a chamber______a low electric current flows.

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问题 An ionizing smoke detector contains a chamber______a low electric current flows.
选项 A、that
B、that is
C、which
D、which
答案D
解析 In which introduces an adjective clause that modifies chamber.
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