题文
It _______ ten years since my sister ______ an English teacher.
| A．has been, is | B．is, became |
| C．have been, was | D．is ,has become |
It _______ ten years since my sister ______ an English teacher.
| A．has been, is | B．is, became |
| C．have been, was | D．is ,has become |
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