He got down to writing the letter as soon as he returned from his walk.

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No sooner had he returned from his walk when he got down to writing the letter.

Not until he returned from his walk did he get down to writing the letter.

Only after he had returned from his walk did he get down to writing the letter.

Hardly had he returned from his walk when he got down to writing the letter.

Giải thích

Đáp án: D

Giải thích: Cấu trúc đảo ngữ với các cụm từ so sánh về thời gian: Hardly/ Scarcely/ Barely + had + S + P2 + when + S + Ved: ngay khi/vừa mới….thì….

Dịch: Anh ấy bắt tay vào viết bức thư ngay sau khi đi dạo về. = Anh ấy vừa mới đi dạo về thì đã bắt tay vào viết bức thư.