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    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 (A) transformed has been (B) processes biofuels, using food (C) crops such as sugar cane, corn and soybeans, which are (D) industry by fermentation or other chemical (E) producing into ethanol or biodiesel.
    A B-D Correct Answer Incorrect Answer
    B A-C Correct Answer Incorrect Answer
    C A-D, B-E Correct Answer Incorrect Answer
    D C-D Correct Answer Incorrect Answer
    E A-B, C-D Correct Answer Incorrect Answer

    Solution

    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.

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