—Would you mind if I borrowed your car just over the weekend?—I'm sorry, but it's just not possible, because I ________ my mother this weekend.
#99756
A
am visiting 
B
have visited
C
was visiting 
D
visited
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—By the way,have you moved into the new house?—Not yet.The walls ________.
#99379
A
were painted
B
are being painted
C
are painted
D
are painting
 His sister left home in 1998,and ________ since.
#99572
A
had not been heard of
B
has not been heard of
C
had not heard of
D
has not heard of