Question
A sentence has been divided into four parts, one of
which may contain an error. Identify that fragment and mark it as your answer. Mark (E) if the sentence contains no error. Air pollution caused by industrial fumes (A)/ have been studied for years, (B)/ but only recently have (C)/ the harmful effects of noise pollution become known (D)/. No error (E)Solution
The subject "Air pollution caused by industrial fumes" is singular, so the verb should also be singular. Therefore, "have" should be corrected to "has" to match the singular subject.
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