[ a, an, the, Zero Article ]
Audience
A. An
B. A

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Comparisons › ViewYou look … (thin) the last time I saw you. Have you lost weight?
A. thiner than
B. thinner than
C. the thinest
D. the thinnest
Grammar › View
What is the subject of this sentence:
Hummingbirds beat their wings 60 times a second.
A. Hummingbirds
B. Hummingbirds beat
C. beat their wings
