Take another look at the sentence:

Class with Dr. Rogers was a nightmare: the clock seemed stuck in place, the air conditioner blew inadequate cool, and a fluorescent bulb buzzed overhead.

When you list grammatical items, you must use parallel structure. In this sentence, you have three short main clauses: the clock seemed stuck in place, the air conditioner blew inadequate cool, and a fluorescent bulb buzzed overhead. The list is thus parallel.

Go to the next sentence.

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