SSC MTS & Havaldar 2019 · Question 3 of 73
The correct answer is option 2. The sentence clearly indicates a possibility by saying that something could have occured if another thing could not have occurred. In the required blank, we need a negative word. The use of 'have' indicates that the required word must use the past tense of 'have' i.e. had. So, option 2 i.e. hadn't is correct.
Source: SSC MTS 2019 paper (16-Aug-2019 Shift 1) compilation with key+explanations, via prepp.in · reliable-secondary
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