[ 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

Random Topics:
Comparatives - SuperlativesVerbs & Verb TensesTransitive and Intransitive VerbVerb to bePrepositions and ConjunctionsAnalogyAdverb of Frequency and TensesVerb Present Simple TensePossessive PronounsPresent Progressive (Future)Other quiz:
Vocabulary › ViewI enjoyed most of the film, but the _ _ _ _ _ _ didn’t tell us what happened to the main character.
A. soundtrack
B. chapter
C. script
D. ending
E. episode
Grammar › View
My brother’s daughter ___ to a good school.
A. go
B. goes
C. going
D. went
She ……………………goes to school by motorbike.
A. often
B. am
C. is
D. are
Prepositions › View
Minh Duc went _________ a walk.
A. to
B. at
C. for