用所给单词的适当形式填空I often hear birds ____ (sing) songs in the tree
用所给单词的适当形式填空
I often hear birds ____ (sing) songs in the tree in the morning
I often hear birds ____ (sing) songs in the tree in the morning
fenglianzi9 幼苗
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sing 用原形 hear sb do sth 听到某人做某事...hear sb do sth 可以是指经常听到...hear sb doing sth听到某人正在做某事。
1年前
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你能帮帮他们吗