问题补充:
He learns English by English songs.
A. listen
B. listen to
C. listening
D. listening to
答案:
A. listen
B. listen to
C. listening
(答案→)D. listening to
解析:句意是:他通过听英语歌学习英语。由介词+doing 可知A和C是错误的,由于listen是不及物动词要是有宾语必须加介词 to,所以答案是D。
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