WHEN / THEY / ARRIVE / WE / HAVE / DINNER. A. WHEN THEY ARRI...

13. - DE KIEM TRA LOP 8 HK II BAI 2
DE KIEM TRA LOP 8 HK II BAI 2

13. When / they / arrive / we / have / dinner.

A. When they arrived, we were having dinner. B. When they were arriving, we were having dinner.

C. When they arrived, we had dinner. D. When they were arriving, we had dinner.