The wide popularity of the Korean music Gangnam Style has _________ heated discussions about people’s tastes nowadays.
#63749
A
set about
B
set aside
C
set off
D
set down
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They ______Hong Kong twice.  
#63785
A
have gone to
B
have been to
C
have been in
D
have gone in
 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