Question

In the following question, a sentence is given with certain words in bold. Choose the pair/s of such words which need to be interchanged so as to make the sentence grammatically correct and meaningful. For years the petroleum (

Q: Answer-In the following question, a sentence is given with certain words in bold. Choose the pair/s of such...

We are in need of a noun at A and a verb at D. So, industry can be moved to A and transformed to D to make the respective clauses meaningful. We need a verb in the continuous form at B, as necessitated by the use of has been. The only one available is producing, which can fit here. Then processes can be pushed to E, completing the phrase chemical processes. The correct sentence is For years the petroleum industry has been producing biofuels, using food crops such as sugar cane, corn and soybeans, which are transformed by fermentation or other chemical processes into ethanol or biodiesel. C is the right answer.