问题
选择题
His sister left home in 1998, and _____ since. [ ]
A. had not been heard of
B. has not been heard of
C. had not heard of
D. has not heard of
答案
答案：B
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His sister left home in 1998, and _____ since. [ ]
A. had not been heard of
B. has not been heard of
C. had not heard of
D. has not heard of
答案：B