Emergency line operators must always _______calm and make sure that they get all the information they need to send help.
A．growB．a(chǎn)ppearC．becomeD．stay
D

試題分析:句意：緊急電話接線員必須總是保持冷靜并且確保他們能夠獲得所有需要的信息以便能夠給予人們幫助。A變得；B看上去，出現(xiàn)；C變得，成為；D保持。固定短語：stay calm“保持冷靜”，選D。
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