_福建成考网

With a lot of work _______,Jerry had no time to go to the cinema with his daughter.（）

• A、doing

• B、having done

• C、done

• D、to do

52.

What have scientists achieved in dealing with floods?（）

• A、They have prevented many rivers from flooding.

• B、They have reduced the damage caused by floods

• C、They have learned much about conditions for flooding.

• D、They have found most of the ice damson the river.