They haven’t visited their grandparents since last Christmas.

89/120

The last time they visited their grandparents was last Christmas.

They last visited their grandparents last Christmas.

They didn’t visit their grandparents last Christmas.

They have visited their grandparents since last Christmas.

Giải thích

Đáp án A

Hướng dẫn giải

"Haven't/hasn't + V3/ed + since" = "The last time + S + V2/ed + was". Lần cuối cùng họ đến thăm ông bà là vào Giáng sinh năm ngoái.