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Emergency line operators must always ________ calm and make sure that they get all the information they need to send help.

Agrow Bappear Cbecome Dstay

 

D

【解析】句意:急诊热线的接线员们必须一直保持冷静,并确保得到他们所需的所有信息以便派出救助。AgrowCbecome都表示变化,与always意义不符合;appear作系动词,表示好像,似乎之意,不符合题意。系动词stay意为保持,符合题意。

 

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