Since ________ all cars sold in ________ have been equipped with seat belts.
举一反三
- All the tickets ______ out when we arrived. A. had sold B. have been sold C. have sold D. had been sold
- All the bikes ________ before I came to the store. A: have sold out B: were sold out C: had been sold out D: have been sold out
- Before the flight takes off, all the passengers are asked to (fast) ______ their seat belts.
- This kind of cloth_______well and large quantities of the cloth ________. A: is sold; have been sold B: is sold; has been sold C: sells; have been sold D: sells ; has been sold
- 中国大学MOOC: All the passengers _____ board the plane should fasten their seat belts.