11.29 时态、语态练习
1.“I don’t like to travel. ”“Have you ever _____ in an airplane?”
a. flying b. flew c. flowed d. flown
2.The center of gravity of the human body ______ behind his joint.
a. located b. locating c. to locate d. is located
3.“Today is very cold, isn’t it?” “Yes, the river is _____ over.”
a. freezed b. freeze c. frozen d. freezing
4.“What happened in that new area?” “New houses ______ recently over there.”
a. are built b. build c. have built d. have been built
5.“When did you go to work?” “As soon as they came, we ______ to work.”
a. went b. were going c. had gone d. go
