公共英语一级

单选题When we arrived at the railway station，they were there．

A．yet
B．once
C．already

参考答案：C进入在线模考
句意：当我们到达车站的时候，他们已经到了。本题考查的是副词的用法。yet和already都是副词，都表示“已经”的意思，但yet用于否定句和疑问句，already用于肯定句，0nce作副词表示曾经。故c正确。【知识拓展】already用于肯定句，放在句中或句尾；yet放在句尾，在疑问句中用来询问说话人期望发生的事情是否已经发生，在否定句中，表示说话人期望发生的事情尚未发生。

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