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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His uncle went abroad in 2010, and _______since.
#63782
A
has not been heard of
B
had not been heard of
C
had not heard of
D
has not heard of
 —Look!Somebody ________ the sofa.—Well,it wasn't me.I didn't do it.(2012·江西)
#63772
A
is cleaning
B
was cleaning
C
has cleaned
D
had cleaned