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Prepositions
He is ignorant _____ he pretends to know.
Explanation and memory cue
The adjective 'ignorant' is conventionally followed by the preposition 'of' when indicating lack of knowledge about something. The phrase 'ignorant of' is the standard and widely accepted usage in English grammar. Therefore, the correct sentence is 'He is ignorant of what he pretends to know.' The option 'to' is incorrect in this context. This is supported by multiple authoritative grammar sources and usage examples.