问题
选择题
| 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 |
答案
答案：D
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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 |
答案：D