Emergency line operators must always ________ calm and make sure that they get all the information t...
2022-10-02 00:12:40 59次 2017-2018学年高中英语（江苏牛津译林版，选修七）Unit 2 单元综合测评 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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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