Hardly ______ the door when the phone rang.
Answer and explanation
Correct answer: B. had he opened
- Step 1: Hardly ... when 句型中，Hardly 放句首時要倒裝，先發生的動作用過去完成式。
- Step 2: 正確為 Hardly had he opened the door when the phone rang。
Answer
had he opened.
Why not the others: he had opened、he opened、did he open不符合題意。
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