it was hard for him to practice oral English at home,where n_____ of his parents spoke the language

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• it was hard for him to practice oral English at home,where n_____ of his parents spoke the language
• it was hard for him to practice oral English at home,where n_____ of his parents spoke the language
• 复数z=[(1+i)^2+3(1-i)]/(2+i),若z^2+a/x
• Have you learned English before?Yes,I ----English for 6 years in my hometown