21. “Have you ever______in an airplane?”(本题1.0分) A、 Flying B、 flew C、 flowed D、 flown
举一反三
- Have you ever flown _____________ Singapore Airlines? What do you think of them? A: in B: at C: via D: on
- _____you ever _____ to Boston? (1.0) A: Did go B: Have gone C: Have been D: Did been
- Do you think that flying an airplane is a ………. experience? A: terrified B: terrifying C: terrify D: terror
- She has never _____ on a plane. A: flown B: flew
- Higher and higher_____ and then it was out of sight. A: flew it B: it flew C: did it fly D: was it flying