WHEN HE WAS IN PARIS, HE ……… ..VISIT PAUL AT WEEKEND. A. USE...

21. - DE KIEM TRA TIENG ANH 10BAI SO 1 HOC KY 1
DE KIEM TRA TIENG ANH 10BAI SO 1 HOC KY 1

21. When he was in Paris, he ……… ..visit Paul at weekend.

A. used B. used for C. used to D. is used to