The window ______ by a stone before anyone noticed.
Answer and explanation
Correct answer: D. had been broken
- Step 1: A passive verb is needed, and the earlier action takes the past perfect passive.
Answer
had been broken.
Why not the others: "has broken" is wrong because it is active and in the wrong tense. "was breaking" is wrong because the active continuous form does not fit the passive meaning. "broke" is wrong because it is active, and the window does not break itself with a stone.
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