He learnt English by______English songs.A.listen B.listen to C.listening to

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He learnt English by______English songs.A.listen B.listen to C.listening to

He learnt English by______English songs.A.listen B.listen to C.listening to
He learnt English by______English songs.A.listen B.listen to C.listening to

He learnt English by______English songs.A.listen B.listen to C.listening to
C
by是介词,后面用动词时就用ing形式