His uncle went abroad in 2010, and_____
问题:
His uncle went abroad in 2010, and_____ since.[ ]
A.has not been heard of
B.had not been heard of
C.had not heard of
D.has not heard of
His uncle went abroad in 2010, and_____ since.[ ]
A.has not been heard of
B.had not been heard of
C.had not heard of
D.has not heard of