Multiple choice

The knight, who was guarding the Holy Grail, was buried.

  1. no change

  2. whom

  3. by whom
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The relative pronoun acts as the subject of the verb "was guarding" in the relative clause. Since it is a subject pronoun, "who" is correct, whereas "whom" is used for objects.

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