题文
________ is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.
| A．Which | B．What |
| C．As | D．That |
推荐试卷
________ is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.
| A．Which | B．What |
| C．As | D．That |
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