The correct answer is Option (2) → not be
The completed sentence is: They recommended that the windows not be opened.
This sentence uses the subjunctive mood, which is required after verbs that express a demand, recommendation, suggestion, or request (like recommend).
In the subjunctive structure:
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The main clause verb is a verb of demand/suggestion (e.g., recommended).
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The subordinate clause uses the base form of the verb (known as the mandative subjunctive).
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For negative statements in the passive voice (which this sentence is, the windows are opened), the structure is not + be + past participle.
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Correct Subjunctive: They recommended that the windows not be opened.
Meanings of the Remaining Incorrect Options
Option 1 – had to: This means “were required to,” which does not fit with “opened” in passive form.
Option 3 – ought not to: This would require the sentence to be “ought not to be opened” .
Option 4 – should not:This would require “should not be opened,” but the word “be” is missing in the option, so it is grammatically incomplete.
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