I began to study English at the age of six.Now l am 15 years old.(保持句意基本不变)I have studied English ___ 9 years ___.

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I began to study English at the age of six.Now l am 15 years old.(保持句意基本不变)
I have studied English ___ 9 years ___.

for already
请及时采纳,多谢!

have,longer

I have studied English from 9 years old.