The chemistry teacher required the students___more attention ___the lab clean.A.to pay,to keepB.to paying,to keeping C.paying,keeping D.to pay,to keeping求详解
问题描述：
The chemistry teacher required the students___more attention ___the lab clean.A.to pay,to keep
B.to paying,to keeping C.paying,keeping D.to pay,to keeping
求详解
答