It is essential that every laboratory worker ______ protective goggles while working in the chemical facility.
Answer and explanation
Correct answer: A. wear
- Step 1: The adjective 'essential' triggers the mandative subjunctive in the subordinate that-clause. The subjunctive takes the base uninflected form 'wear', regardless of the singular subject 'every laboratory worker'. Answer: wear. Why not the others: "wears" uses third-person singular indicative '-s', which violates mandative subjunctive grammar; "must wear" adds redundant modal 'must' inside a clause already governed by the mandative adjective 'essential'; "will wear" uses future indicative modal 'will', violating the formal subjunctive requirement.
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