问题描述：
一道英语选择题,请回答并解析,在问题补充里
The manager was concerned to hear that two of his trust workers—————
A.will leave B.are leaving C.have left D.were leaving
The manager was concerned to hear that two of his trust workers—————
A.will leave B.are leaving C.have left D.were leaving
问题解答：
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