Question

When I arrived the students (already, go) ............... into class.

Answer 1

When I arrived, the students had already gone into class.

Answer 2

When I arrived, the students had already gone into class.

Answer 3

When I arrived, the students (already, go) had already gone into class.

CT: When + S + V2/ed + O, S + had + V3/ed + O

Dịch: Khi tôi đến thì các học sinh đã chuẩn bị đi vào lớp.