[ Grammar for TOEFL ]
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:

Random Topics:
TenseIf Conditional Zero and OneZero Conditional SentenceTypes of PhrasesQuantifiersWill and Going toImperative SentencesJobsDefinite pronouns (Subject, Object, Reflexive)Modals of Obligation and NecessityOther quiz:
Modal Verbs › ViewHe ___ play the piano very well.
A. can
B. could
C. should
Vocabulary › View
Which sentence best uses this word: staged
A. The fight was clearly staged to attract media attention.
B. She staged her homework on the table.
C. He carried a staged of pencils in his backpack.
D. They wore staged to the performance.
