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

游客2023-12-30 23

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

解析画线部分应该表示“过去的过去”，应该用过去完成进行时，所以答案为D。句意：当这架飞机的飞行员被告知应使用西区机场时，他驾驶的飞机已在降落场的上空盘旋了15分钟。

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Theplanewascirclingoverthelandingfieldfor15minuteswhenthepilotwas