—Have you seen your friend off ? —Yes. I...

—Have you seen your friend off ?

—Yes. I watched the train leaving the station it disappeared from sight.

A．unless

B．as if

C．so that

D．until

D 【解析】试题分析：考查词和词组意思，unless意思“除非”， as if意思“好像”，so that意思“以至于”，until意思“直到……”，句子意思“我看卓火车离开车站直到从我的眼前消失”，所以选D 考点：考查词和词组意思

考点分析：

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