题文
In much of the animal world，night is the time________for sleep—pure and simple.
(2013·湖北，26)
| A．set aside | B．set down |
| C．set off | D．set up |
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In much of the animal world，night is the time________for sleep—pure and simple.
(2013·湖北，26)
| A．set aside | B．set down |
| C．set off | D．set up |
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