Barrack Obama __________ President of the United States since 2010.
#63757
A
became a
B
has become a
C
has turned
D
has been
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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
Tom ________ in the library every night over the last three months.(2011·北京)
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A
works
B
worked
C
has been working
D
had been working
---I’m very sorry to have ___ you with so many questions. ---It doesn’t matter.
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A
forbidden
B
excused
C
impressed
D
bothered
Minister Bill De Blasio in office fewer than 48 hours when he came face to face with his biggest challenge in his life．
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A
has been
B
had been
C
would be
D
is
—Does he know how to work out the problem? —Yes, he has _______ a good idea to solve it.
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A
caught up with
B
kept up with
C
come up with
D
put up with