Had Anil been on time, he….. missed the train.

The correct answer is would not have.

Step-by-Step Explanation:

1. Identify the Sentence Structure:
The given sentence is a third conditional sentence expressing an unreal or hypothetical situation in the past:
"Had Anil been on time, he….. missed the train."

2. Understand the Third Conditional Rule:
The third conditional is used to describe a past condition that did not happen and its hypothetical result in the past. Standard third conditional structure:

$\text{If}+\text{Past Perfect},\text{would/could/might have}+\text{Past Participle (V3)}$

$\text{Had}+\text{Subject}+\text{Past Participle (V3)},\text{Subject}+\text{would have}+\text{Past Participle (V3)}$

3. Analyze the Options:
• "Had Anil been on time" represents the inverted condition (equivalent to "If Anil had been on time").
• The result clause requires the auxiliary phrase would not have followed by the past participle verb "missed".
• Therefore, completing the sentence gives: "Had Anil been on time, he would not have missed the train."