Hardly did he enter the room when all the lights went out.
A. did he enter
B. when
C. the lights
D. went
Đáp án A thành “had he entered”
Giải thích: Đảo ngữ với “hardly” là thì quá khứ hoàn thành. “Hardly …. when …..” (vừa làm gì đó thì …).
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