In the last few years thousands of films ________ all over the world.
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A
have produced
B
have been produced
C
are producing
D
are being produced
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Barrack Obama __________ President of the United States since 2010.
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A
became a
B
has become a
C
has turned
D
has been
I got caught in the rain and my suit _______.
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A
has ruined
B
had ruined
C
has been ruined
D
had been ruined
 Up to now, our society ________ with limited living space and a shortage of natural resources.
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A
has been challenged
B
is being challenged
C
is challenging
D
has challenged