No sooner do the bells ring than the curtain rose.

The answer "had the bell rung" is correct because it uses the past perfect tense, which is appropriate in this context. The phrase "No sooner do the bells ring than..." indicates that the action of the bells ringing happens immediately before another action, which is the curtain rising.

Here’s a breakdown of why this option is appropriate:

    
• Past Perfect Tense: "had rung" shows that the ringing of the bells occurred before the curtain rose.
    
• Sequence of Events: Using past perfect clarifies the order of these events in the past, implying that the action of ringing completed just before the curtain rising.

In contrast, the other options either do not correctly express this sequence or use incorrect forms, making them unsuitable for this sentence.

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