We all want to know who can________the physics problem?You know，it’s very difficult．
| A．work out |
| B．take out |
| C．set out |
| D．look out |
We all want to know who can________the physics problem?You know，it’s very difficult．
| A．work out |
| B．take out |
| C．set out |
| D．look out |
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