________successful 'hydrogen bomb' test when many countries reacted with condemnation and suspicion

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Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Hardly North Korea had claimed

Hardly had North Korea claimed

No sooner North Korea had claimed

No sooner had North Korea claimed

Giải thích

Chọn B

Cấu trúc đảo ngữ với Hardly: “Hardly +had +S + động từ phân từ II+…+when+ mệnh đề ở thì quá khứ đơn”