Nylon, a synthetic done (a) from a combination(b) of water, air and a by product of coal(c) was frist introduced(d) in 1938.Identify the one underlined word or phrase that must be changed in order for the sentence to be correct:
A. a
B. b
C. c
D. d
সঠিক উত্তরঃ
A.
a
Explanation:

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