My sister ____English since she was 9years old．She can talk to foreigners freely．（ ）
| A． |
Learn |
B． |
know |
| C． |
has learn t |
D． |
have learn t |
My sister ____English since she was 9years old．She can talk to foreigners freely．（ ）
| A． |
Learn |
B． |
know |
| C． |
has learn t |
D． |
have learn t |
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