It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.
#63767
A
had wiped out
B
have wiped out 
C
have been wiped out 
D
had been wiped out
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Mary said that she  ___________ London.
#63780
A
has never gone to
B
has never been ,to
C
had never been to
D
had never gone to
 It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.
#63767
A
had wiped out
B
have wiped out 
C
have been wiped out 
D
had been wiped out
—Does he know how to work out the problem? —Yes, he has _______ a good idea to solve it.
#63779
A
caught up with
B
kept up with
C
come up with
D
put up with