Past unreal condition: had + past participle ... would have + past participle

This type of question, asked 3 times: 17 Sep 2024 S3, 14 Sep 2025 S1, 15 Sep 2025 S1. All 3 questions below, oldest first.

Try each one first, then open its answer.

Question 1
17 Sep 2024 S3
88 $Select the most appropriate option that can substitute the underlined segment in the given sentence. If no substitution is required, select ‘No substitution’. If it had not rained, they would not postpone the programmes.$
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Question 2
14 Sep 2025 S1
95 $Choose the most suitable option to replace the highlighted part of the sentence: Had I known about the traffic, I *will leave early. *$
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Question 3
15 Sep 2025 S1
87 $Find the part of the sentence that contains an error: Were he to have responded promptly (1)/ the crisis could have been (2)/ averted far earlier than it ultimately was (3)/ saving valuable diplomatic capital. (4)$
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Question 1