Which of the following sentences contains an error in punctuation?
  1. The athlete plays several sports during the school year: baseball, basketball, volleyball, and tennis.
  2. The movie was fantastic but, I had to leave for a moment to take a telephone call.
  3. I worked all night long to complete the project; my professor will be impressed with the product.
  4. Don't you think that it's always a good idea to knock before entering any room?
Explanation
Correct Response: B. The sentence for B is a compound sentence; that is, it consists of two main clauses. In a compound sentence, the clauses may be joined by a coordinating conjunction preceded by a comma. In this case, however, the comma incorrectly follows the conjunction but. The sentences for A, C, and D show correct use of the colon, semicolon, and apostrophe, respectively.
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