The chemistry teacher asked 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 |
The chemistry teacher asked 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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