.. SWAMPS IS NECESSARY TO RECLAIM LAND.A. DRAINAGEB. DRAININGC. DRA...
20... swamps is necessary to reclaim land.
a. Drainage
b. Draining
c. Draining of
d. Drained
--> b
20... swamps is necessary to reclaim land.
a. Drainage
b. Draining
c. Draining of
d. Drained
--> b