The chemistry teacher required the students___more attention___the lab clean
| A．to pay;to keep |
| B．to paying;to keeping |
| C．to pay;to keeping |
| D．paying;keeping |
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The chemistry teacher required the students___more attention___the lab clean
| A．to pay;to keep |
| B．to paying;to keeping |
| C．to pay;to keeping |
| D．paying;keeping |
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