In spring,we can hear birds -----(sing) in the trees
应该是填sing 还是singing呐
老师说是填singing的
这是为什么呢?
人气：434 ℃ 时间：2020-05-19 12:47:52
解答
singing
hear sb doing sth 听见鸟儿正在树林里唱歌
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