1. They were laughing at the clown.
  2. They were laughing on the clown.
  3. They laughed at the clown.
  4. The clown was laughed at by them.
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1 Answers

Answer: Option 1

They were laughing at the clown. Given sentence is in past continuous tense and it is in passive voice. Rule : Subject + (was/were) + V-ing + Other agents

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