2. 外语
  3. The traditional view is______ we sleep because our brain is "programmed" to make us do so.

The traditional view is______ we sleep because our brain is "programmed" to make us do so.

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问题 The traditional view is______ we sleep because our brain is "programmed" to make us do so.
选项 A、when
B、why
C、whether
D、that
答案D
解析
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