[ Grammar ]
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
Select your answer:

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Passive Voice, Modals of Deduction and First ConditionalModal Verbs & Perfect InfinitiveTenses and StructureSimple Present and Present Continuous TenseModals of ObligationVerb Forms and PrepositionsSimple Past vs Past Continuous TenseConditional Sentences and AdverbsGrammar : Must (Necessity)Passive Voice and ModalsOther quiz:
Passive Voice › ViewSomebody has robbed the bank.
A. The bank has been robbed.
B. The bank is been robbed.
C. The bank have been robbed.
Antonyms › View
To abandon; to scap, junk
A. Efface
B. Salvage
C. Deadlock
