they find listening to the tape is ----(use) learn English

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they find listening to the tape is ----(use) learn English
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they find listening to the tape is ----(use) learn English
they find listening to the tape is ----(use) learn English

they find listening to the tape is ----(use) learn English
useful
他们发现听磁带学英语很有用.
PS:learn前是否丢了个to?

useful to