Our plane delayed taking off as we ran into a storm. We were ________ for several hours at the airport, waiting for the storm to clear up.
A.figured out | B.built up | C.held up | D.taken off |
—Why does the lake smell terrible?
—Because large quantities of water ________.
A.have polluted | B.is being polluted |
C.has been polluted | D.have been polluted |
His sister left home in 1998,and ________ since.
A.had not been heard of | B.has not been heard of |
C.had not heard of | D.has not heard of |
In the near future,more advances in the robot technology ________ by scientists.(2011·湖南)
A.are making | B.are made |
C.will make | D.will be made |
John, a friend of mine, who got married only last week, spent $3,000 more than he ________ for the wedding.
A.will plan | B.has planned |
C.would plan | D.had planned |
—Hurry up!Alice and Sue are waiting for you at the school gate.
—Oh!I thought they ________ without me.
A.went | B.are going |
C.have gone | D.had gone |