改错how long have you (begun to study)english.改错how long have you (begun to study)english.i have (borrowed)this book for two weeks.the river has(become)very dirty since last august.our manager is away today.he has(been)to guangzhou on business.

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改错how long have you (begun to study)english.
改错how long have you (begun to study)english.
i have (borrowed)this book for two weeks.
the river has(become)very dirty since last august.
our manager is away today.he has(been)to guangzhou on business.
he has (gone)out for two years.

begun改成begin