Select the sentence that correctly uses the past perfect tense to establish chronological sequence.
Answer and explanation
Correct answer: D. The conservators had completed the stabilization before the gallery opened to the public.
- Step 1: When two events occurred in the past, the earlier event takes the past perfect ('had completed').
- Step 2: The later past event takes the simple past ('opened').
Answer
The conservators had completed the stabilization before the gallery opened to the public.
Why not the others: The sentence 'The conservators completed the stabilization before the gallery had opened...' reverses the tenses; the sentence 'The conservators have completed...' pairs present perfect with past; the sentence with 'would open' uses conditional 'would open' unnecessarily.
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