He had just finished eating his breakfast. Then he fell down.

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Hardly did he finished eating his breakfast when he fell down.

Hardly he had finished eating his breakfast when he fell down.

Hardly have he finished eating his breakfast when he fell down.

Hardly had he finished eating his breakfast when he fell down.

Giải thích

Kiến thức: Thì quá khứhoàn thành & quá khứ đơn

Giải thích:

Hardly + had + S + PII + when S + Ved/ V2 = No sooner had + S + PII + than + S + Ved/ V2: Ngay khi...

thì...

Tạm dịch: Anhấy chỉvừa ăn sáng. Rồi anhấy bịngã.

A. sai ngữ pháp: did => had

B. sai ngữ pháp: he had => had he

C. sai ngữ pháp: have => had

D. Ngay khi anh ấy ăn sáng xong thì anh ấy bị ngã. => đúng

Chọn D