____ the funding been approved earlier, the building would have opened on schedule.
Answer and explanation
Correct answer: D. Had
- Step 1: The main clause 'would have opened' shows a third conditional (an unreal past). Step 2. In formal writing, 'if + had' can be replaced by inversion: Had + subject + past participle. Answer: Had. Why not the others: 'Has' is present perfect; 'Were' inverts only second-conditional 'if... were'; 'Should' inverts first-conditional possibilities.
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