It was 12 o’clock ______the plane took off.
A. when
B. that
C. since
D. till
正确答案：A
15．答案为A参考译文：这架飞机起飞的时间是12点when引导定语从句修饰先行词为时间名词
Itwas12o’clock______theplanetookoffAwhenBthatC
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