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
We complained to the travel agency about the horrible service during our trip，but no one has________by now.
#63750
A
responded
B
deserved
C
recovered
D
survived
—Why do you charge me so much for such a simple meal! I wonder if you got mistaken. —Oh, I have _______ in your bill the cost of the expensive plate you broke just now.
#63753
A
released
B
included
C
contained
D
covered
Tom ________ in the library every night over the last three months.(2011·北京)
#63775
A
works
B
worked
C
has been working
D
had 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
Barrack Obama __________ President of the United States since 2010.
#63757
A
became a
B
has become a
C
has turned
D
has been