Air pollution caused by industrial fumes has been studied A for years but only recently has B the ha...........

English ( Master) Tenses

Directions : In these questions , read each sentence to find out whether there is any error in it. The error, if any, will be in one part of the sentences .The number of that part is the answer, if there is no error, the answer is (d). (Ignore errors of Punctuation, if any.)

Air pollution caused by industrial fumes has been studied (A)/ for years, but only recently has (B)/ the harmful effects of noise pollution become known(C)/. No error.(D)

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