BY ______ 1,500,000 TONS OF INSECTS A YEAR, BIRDS GREATLY HELP AME...
12. By ______ 1,500,000 tons of insects a year, birds greatly help American farming.
A. eating
B. eat
C. having eaten
D. ate
12. By ______ 1,500,000 tons of insects a year, birds greatly help American farming.
A. eating
B. eat
C. having eaten
D. ate