Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.
| A．grow |
| B．appear |
| C．become |
| D．stay |
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Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.
| A．grow |
| B．appear |
| C．become |
| D．stay |
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