20. 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 |
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20. 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 |
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