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来源：网络整理 2026-01-12 22:42:28
They _______ a meeting at 9 o'clock yesterday morning.
A. have B. had C. are having D. were having
答案：D
解析：at 9 o'clock yesterday morning是过去某个具体时刻，用过去进行时were having，表示“当时正在开会”。
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