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Question

Difficulty: Very hardVerbs, Tenses, and Aspect

Complete the sentence below by filling in the blank with the most grammatically appropriate verb form.

Answer:Had the diplomatic envoy not intervened so promptly, the regional border dispute 【would have escalated】 into an outright military conflict long before peaceful negotiations could resume.

Answer

would have escalated
The sentence utilizes an inverted third conditional structure ('Had the diplomatic envoy not intervened...'), expressing a counterfactual or unfulfilled past condition. The main clause requires the perfect conditional construction 'would have escalated' to represent what hypothetically would have occurred in the past had the condition not been met.

Step-by-Step Solution

1
Analyze the conditional clause structure at the beginning of the sentence.
The clause 'Had the diplomatic envoy not intervened so promptly' represents an inverted third conditional structure, equivalent to 'If the diplomatic envoy had not intervened...'
Inverting the subject and the auxiliary verb 'had' removes the subordinator 'if' while retaining the unreal/unfulfilled past conditional meaning.
2
Determine the appropriate verb form and aspect for the main (consequence) clause.
The main clause must take the perfect conditional form: 'would have' + past participle ('escalated').
An unfulfilled past condition requiring the past perfect in the dependent clause must strictly pair with the modal perfect aspect in the main clause to express hypothetical past results.

Key Concept

Inverted Third Conditional and Unfulfilled Past Aspect
Estimated Time:1m 30s
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Topics

Verbs, Tenses, and Aspect

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