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 |