单选题The plane was circling over the landing field for l5 minutes when the pilot was told that he should use the Westside Field.AisBWould beChas beenDhad been
单选题
The plane was circling over the landing field for l5 minutes when the pilot was told that he should use the Westside Field.
A
is
B
Would be
C
has been
D
had been
参考解析
解析：
时态应用题。划线部分应该表示“过去的过去”，应该用过去完成时，所以主句的时态就是过去完成进行时，因此答案为D。句意：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l5分钟。
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单选题The plane was circling over the landing field for l5 minutes when the pilot was told that he should use the Westside Field.AisBWould beChas beenDhad been