Rarely ---- such widespread consensus among climatologists regarding the anthropogenic origin of rapid glacier retreat.
Answer and explanation
Correct answer: B. has there been
- Step 1: Sentences beginning with negative or restrictive adverbs ('Rarely') require subject-auxiliary inversion.
- Step 2: 'Rarely has there been ...' provides the correct inverted present perfect structure.
Answer
has there been.
Why not the others: 'there has been' lacks inversion; 'there was' lacks inversion; 'there had been' lacks inversion.
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