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