THE TETRACYCLINES, ………
30. The tetracyclines, ………. Antibiotics, are used to treat infections.
A. are a family of
B. being a family
C. a family of
D. their family is
30. The tetracyclines, ………. Antibiotics, are used to treat infections.
A. are a family of
B. being a family
C. a family of
D. their family is