Answer and explanation

Correct answer: A. The students, who had studied hard, passed the test.

  1. Step 1: A non-defining clause is placed between commas. Step 2. Both commas are needed around 'who had studied hard'. Answer: The students, who had studied hard, passed the test. Why not the others: The others use one comma only, miss a comma, or use a semicolon incorrectly.

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Which sentence is… | Iraqi National English Proficiency Test (INPT)