题文
【2014年山东省临沂市中考】Talk to your teacher and you will get help ________ you have a problem.
| A．unless | B．if | C．until | D．so |
【2014年山东省临沂市中考】Talk to your teacher and you will get help ________ you have a problem.
| A．unless | B．if | C．until | D．so |
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