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I _________ THERE ONCE A LONG TIME AGO AND _______...
I _________ THERE ONCE A LONG TIME AGO AND __________ BACK SINCE.A....
KIEM TRA 15
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7. I _________ there once a long time ago and __________ back since.a. went / have not been b. go / am not c. have gone / was d. was going / had not been
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7.
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KIEM TRA 15