过去进行时:表示过去某时正在进行的动作: Last week she wasn’t feeling very well. 上星期她感到不太舒服。 An old lady was waiting for the bus. 一位老太太(这时)正在等车。 The sun was setting. 太阳正在西沉。 Birds were singing in the trees. ... 阅读全部 »

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