Answer:
The correct use of grammar is in the option 2. "Suddenly, the lights flicker and an uninvited guest enters the room."
Explanation:
This is because both of the verbs (flicker and enters) are both used in the present tense. In option 1, flicered is past tense, and enters is present tense. In option 3, flicker is present tense, and entered is past tense
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