How long is it since he _____this school？
He _____for three years．（ ）
| A． |
has left； has left |
| B． |
left； has been away |
| C． |
leaves； has left |
How long is it since he _____this school？
He _____for three years．（ ）
| A． |
has left； has left |
| B． |
left； has been away |
| C． |
leaves； has left |
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