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 |