Three trees can do the job of 15air-conditioners _________ almost all day.
| A．run | B．are running | C．ran | D．running |
相关试题
---How about ______ a picnic with us?
---I’d like that, thanks.
A. going B. to have C. having
---What’s the time, please?
---It’s ________.
A. half to seven
B. half past seven
C. seven thirty o’clock
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