Question

if the blue text contains an error, click to fix it.
when marlin discovered whom had stolen the classroom pet, he gasped in surprise.
submit answer
report a problem

Explanation:

The word "whom" is incorrect here. In this context, we need a subject pronoun because it's the subject of the verb "had stolen". The correct pronoun should be "who" since "who" is used as a subject, while "whom" is used as an object. So we should replace "whom" with "who".

Answer:

Replace "whom" with "who" in the sentence "When Marlin discovered whom had stolen the classroom pet, he gasped in surprise." to get "When Marlin discovered who had stolen the classroom pet, he gasped in surprise."