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    【题目】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

    【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。A项grow和C项become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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