[ 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:

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Prepositions of Timetake, make, doTime ConjunctionsAcademic VocabularyApostrophes and Quotation MarksPresent Simple, Present Continuous or Present PerfectAsking & Giving AttentionComparatives ( adj/ adv)Modal Verbs and ConjuctionsConditional Sentences Type 1Other quiz:
Vocabulary › View____ communication skill plays an important role in career success.
A. Personal
B. Individual
C. Interpersonal
D. Interactive
Grammar › View
This is ______ room and that is ours.
A. their
B. they’re
C. there
D. we’re