Exactly which bacteria cause the ______ is still unknown.
举一反三
- The fire was _____ by the firefighters, but the cause of the fire was still unknown.
- Choose the best one to complete the sentence. 1. The fire was ______ by the firefighters, but the cause of the fire was still unknown.
- The reason ______ the accident occurred is still unknown. A: why B: what C: how D: which
- Questions 20-23 based on the news you’ve just heard. Which statement is true about the car collision A: One driver caused it. B: Two drivers were speeding. C: The cause is still unknown. D: One person was badly hurt.
- The fire was______<br/>by the firefighters, but the cause of the fire was still unknown. A: put<br/>up B: put out C: put<br/>away D: put<br/>off