Students are often warned that anyone who leaves the classroom at night must remember to __________ all the lights, or he will be fined.
| A．switch off |
| B．go off |
| C．take off |
| D．bring off |
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Students are often warned that anyone who leaves the classroom at night must remember to __________ all the lights, or he will be fined.
| A．switch off |
| B．go off |
| C．take off |
| D．bring off |
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