The plane was circling over the landing field for 15 minutes when the pilot was

游客2025-01-30 42

问题 The plane was circling over the landing field for 15 minutes when the pilot was told that he should use the Westside Field.

选项 A、is
B、would be
C、has been
D、had been

答案 D

解析时态应用本句意为：当这架飞机的飞行员被告知可以使用西郊机场时，他驾驶的飞机已在着陆地的上空盘旋了15分钟。在此因为表示“过去的过去”，应该用过去完成时；因此D为答案。

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