In an engineering research paper, which sentence correctly uses a concessive participle clause?
Answer and explanation
Correct answer: A. Although manufactured under strict tolerances, the ceramic valve failed during thermal shock
- Step 1: A reduced concessive clause retains the conjunction 'although' followed directly by a past participle ('manufactured') to denote a passive state of concession. Answer: Although manufactured under strict tolerances, the ceramic valve failed during thermal shock. Why not the others: 'manufacturing' is active, while 'was manufactured' and 'had manufactured' lack subjects in an ungrammatical hybrid structure.
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