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Verbal·Standard English Conventions·Boundaries

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Within Earth’s biomes, there are four main types of desert: arid, semiarid, coastal, and cold. The Australian Desert in Australasia is an arid __________ with a total area of about $2,700,000{\text{ km}}^2$, it is one of the largest deserts of any type.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

desert,

B

desert, and

C

desert and

D

desert