Unfortunately, those who_____ the accident cannot recall what happened, Therefore the cause of the accident remains a mystery.
举一反三
- —————————— is not clear. A: what caused the accident B: what did cause the accident
- ― _____ An accident has happened. A. Where was the accident? B. What happened? C. When was the accident? D. Why did it happen?
- ________ caused the accident is still a complete mystery.
- ()caused the accident is still a complete mystery A: What B: That C: How D: Where
- It was not until the accident happened _______.