I often hear birds ( )in the morning?是填to sing 还是填singi

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Ioftenhearbirds()inthemorning?是填tosing还是填singiIoftenhearbirds()inthemorning?是填tosing还是填singiIoftenhe

I often hear birds ( )in the morning?是填to sing 还是填singi
I often hear birds ( )in the morning?是填to sing 还是填singi

I often hear birds ( )in the morning?是填to sing 还是填singi
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