题文
In our class，when the bell rang and the teacher closed his book，it was a ________for everyone to stand up.
| A．signal |
| B．chance |
| C．mark |
| D．measure |
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In our class，when the bell rang and the teacher closed his book，it was a ________for everyone to stand up.
| A．signal |
| B．chance |
| C．mark |
| D．measure |
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