In each of these questions, each sentence has four words or phrases in braces marked A, B, C and D. Choose one word or phrase that must be changed for the sentence to be correct.
Drug abuse {have} (A) become {one of} (B) our {most} (C) serious social {problems}. (D)
A is incorrect.
Correct sentence:Â Drug abuse has become one of our most serious social problems.
The answer is option A.
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