An intransitive verb can go passive when it is followed by a:
AProgression
BPreposition
CProposition
DProportion
Answer & Solution
Correct answer: B. Preposition
1. Everybody laughed at him becomes He was laughed at.
2. The object of that word becomes the subject.
3. The verb must be followed by a preposition.
_Source: Kittredge, An Advanced English Grammar with Exercises (Project Gutenberg)_
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