—______ did your sister leave China?
—She______ for three years .
| A．When, has left | B．When ,has been away |
| C．How long,has left | D．How long,has been away |
—______ did your sister leave China?
—She______ for three years .
| A．When, has left | B．When ,has been away |
| C．How long,has left | D．How long,has been away |
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