Answer:
D. is a hobby
Explanation:
According to my research on the English language, I can say that based on the information provided within the question the correct statement for this question would be "is a hobby". Therefore the whole correct sentence would be "Stamp collecting is a hobby sometimes used in the schools to teach economics and social studies."
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Answer:D Is a hobby
Explanation:
This is the best answer because it avoids the sentence fragment error at the original sentence by providing the verb" is" to carry out the action of the sentence.
