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:急診熱線的接線員們必須一直保持冷靜,并確保得到他們所需的所有信息以便派出救助。A項(xiàng)growC項(xiàng)become都表示變化,與always意義不符合;appear作系動(dòng)詞,表示好像,似乎之意,不符合題意。系動(dòng)詞stay意為保持,符合題意。

 

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