Staff remaining in the lounge should notify their immediate supervisors before__

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问题 Staff remaining in the lounge should notify their immediate supervisors before_______to their work.

选项 A、returning
B、returns
C、returned
D、to return

答案 A

解析空格内应填入非谓语动词。由于before是连词，后面填入分词形式的A选项或C选项都有可能。这个分词用来修饰主句中的主语staff，而staff是return to their work的行为主体。因此主动语态的A选项是正确答案。

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