Identify the underlined word or phrase (A,B,C,D or E) that must be changed in order for the sentence to be correct.Scientists are trying (A) to device (B) an inexpensive (C) substitute (D) for (E) gasoline.
A. A
B. B
C. C
D. D
E. E
সঠিক উত্তরঃ
B.
B
Explanation:

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