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4. (2014 •山东济南模拟) He didn't know how he could improve his listening skills.(合并成一句)
He didn't know how his listening skills.
4. to improve
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4. (2014 •山东济南模拟) He didn't know how he could improve his listening skills.(合并成一句)
He didn't know how his listening skills.
4. to improve