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英语
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I often hear birds ( )in the morning?是填to sing 还是填singi
人气:457 ℃ 时间:2020-05-02 13:24:19
解答
我觉得都不对,应该是sing
hear sb do或doing,而singing表示正在唱歌,often暗示是经常发生的事,应该用表示一般现在状态的sing
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