Up to now, our society ________ with limited living space and a shortage of natural resources.
#63760
A
has been challenged
B
is being challenged
C
is challenging
D
has challenged
推荐题目
The world's first flying car has been ________ for sale at ￡800,000 by Courtesy Aircraft of the US.
#63765
A
taken up
B
put up
C
pulled up
D
made up
It's said that they ________ a better life ever since they moved to the US.
#63764
A
had enjoyed
B
have been enjoying
C
were enjoying
D
would enjoy
Because of the bad weather, my mother ____ and lay in bed. She ______ for a week.
#63793
A
has been ill; was ill
B
fell ill; has fallen ill
C
fell ill; has been ill
D
fell ill; is ill
Kate ________ on her new novel, which is supposed to come out next month.
#63761
A
was working
B
had worked
C
will be working
D
has been working
—I remember you were a talented pianist at college.Can you play the piano for me?—Sorry，I ________ the piano for years.(2012·湖南)
#63770
A
don't play
B
wasn't playing
C
haven't played
D
hadn't played