[ 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
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Grammar › ViewYesterday I found some boys are catching fish in the pond.
A. Yesterday I found some boys caught fish in the pond.
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We must protect the _____in order to preserve our heritage for future generations.
A. limestone
B. valley
C. ecosystem
D. original
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