The instant the fire alarm rang, everyone evacuated the building in an orderly manner.

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No sooner had the fire alarm gone off than the occupants calmly exited the building.

The building’s residents hesitated before reacting to the fire alarm that rang suddenly.

Following the fire alarm, people re-entered the building to collect their belongings.

Only after the firefighters arrived did people begin to leave the building.

Giải thích

 Phương pháp giải: Đảo ngữ chỉ thời gian.

 Giải chi tiết:

· Gốc: The instant... (Ngay khi chuông reo, mọi người sơ tán).

· A: No sooner had the fire alarm gone off than... (Chuông vừa mới reo thì...).

· Công thức: No sooner + had + S + V3 + than + S + V2.

 Đáp án: A