I _ someone singing in the next door when I _ music .A\ listen; hear B\ listen to hear C\ hear listen D\ hear ;listen to

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$I _ someone singing in the next door when I _ music .A\ listen; hear B\ listen to hear C\ hear listen D\ hear ;listen to$

I _ someone singing in the next door when I _ music .A\ listen; hear B\ listen to hear C\ hear listen D\ hear ;listen to
I _ someone singing in the next door when I _ music .
A\ listen; hear B\ listen to hear C\ hear listen D\ hear ;listen to

I _ someone singing in the next door when I _ music .A\ listen; hear B\ listen to hear C\ hear listen D\ hear ;listen to
D\ hear ;listen to
hear sb.doing
listen to sth.
固定搭配