Step 1: Concept When two actions happened in the past, the action that occurred first is expressed in the Past Perfect tense (had + V3).
Step 2: Meaning There are two events: the theft and the watchman noticing. The theft happened before the noticing.
Step 3: Analysis "Even before" signals that we need the Past Perfect for the earlier event. "Happened" (simple past) should be replaced with "had happened".
Step 4: Conclusion "Had happened" is the correct grammatical alternative.
Final Answer: (D)
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