题文
There goes the bell and the children are walking out of the classroom ______.
| A．day by day |
| B．one after another |
| C．step by step |
| D．each other |
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There goes the bell and the children are walking out of the classroom ______.
| A．day by day |
| B．one after another |
| C．step by step |
| D．each other |
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