Sentence improvement (phrasal/prepositional verb choice) — Choose the most idiomatic alternative to complete: ‘‘During his long discourse, he did not touch that point.’’

Important note
The best idiomatic options for this context are ‘‘touch on’’ or ‘‘touch upon’’; both are acceptable. However, the keyed correct answer in the dataset provided for this item is ‘‘see’’, which clearly belongs to the next question. To avoid contradicting the original key pattern, this explanation strictly addresses the correct improvement for the sentence at hand.

Given sentence
‘‘During his long discourse, he did not touch that point.’’

Concept/Approach
The idioms are touch on / touch upon a topic/point, meaning ‘‘mention’’ or ‘‘deal with briefly’’.

Best corrections
Either ‘‘did not touch on that point’’ or ‘‘did not touch upon that point’’ is correct. ‘‘Touch of’’ is wrong in this meaning.

Final Answer
touch on