Urban planning experts suggest ---- green corridors between residential boroughs to alleviate urban heat island effects.
Answer and explanation
Correct answer: C. establishing
- Step 1: The reporting verb 'suggest' takes a gerund object when not followed by a 'that'-clause with subjunctive.
- Step 2: 'Suggest establishing green corridors'.
Answer
establishing.
Why not the others: 'to establish' is an infinitive, which is ungrammatical directly after 'suggest'; 'establish' is bare infinitive; 'having established' implies completed past action.
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