Final answer:
The sentence that has an inappropriate shift in verb voice is: When my friends arrived at my apartment, the doorbell was rung.
Step-by-step explanation:
The sentence that has an inappropriate shift in verb voice is: When my friends arrived at my apartment, the doorbell was rung.
In this sentence, there is a shift from active voice to passive voice. The active voice is used in the first part of the sentence 'my friends arrived at my apartment,' but then it shifts to passive voice in the second part 'the doorbell was rung.' This creates an inconsistency in verb voice.
To maintain consistency and avoid a shift in verb voice, the sentence could be rewritten as 'When my friends arrived at my apartment, I rang the doorbell.'
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