Rarely ______ such rapid technological disruption across multiple legacy industrial sectors simultaneously.
Answer and explanation
Correct answer: D. has the world witnessed
- Step 1: When the negative adverb 'rarely' heads a declarative clause, subject-auxiliary inversion is mandatory. The auxiliary 'has' precedes the subject 'the world', followed by past participle 'witnessed'. Answer: has the world witnessed. Why not the others: "the world has seen such extensive disruption" fails to invert the auxiliary and subject following the initial negative adverb 'rarely'; "is the world seeing" uses progressive aspect which is unidiomatic for overarching historical assessments; "the world was seeing" omits mandatory inversion and uses past continuous without specific temporal anchor.
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