Choose the correct completion:
'So complex [...] that several supercomputers were networked to simulate the molecular interactions.'
Answer and explanation
Correct answer: D. was the protein folding algorithm
- Step 1: When an adjective phrase introduced by 'So [adjective]' is fronted for rhetorical emphasis, subject-verb inversion is required: 'So complex was the algorithm that...'. Step 2. Correct inverted form: 'was the protein folding algorithm'. Answer: was the protein folding algorithm. Why not the others: Fronting 'So + adj' requires inversion with 'was'.
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