In technical writing, which sentence correctly uses a cleft sentence to emphasize the critical factor in an experiment?
Answer and explanation
Correct answer: B. It was the faulty pressure regulator that caused the system failure
- Step 1: An 'it-cleft' sentence structure ('It is/was + emphasized element + that-clause') puts dramatic focus on the key cause or agent. Answer: It was the faulty pressure regulator that caused the system failure. Why not the others: 'There was ... what' is ungrammatical, the third contains redundant pronouns, and the fourth lacks a valid relative subject head.
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