Question

i saw___his trick(preposition)

Answer 1

i saw one of his trick

Answer 2

The answer is ‘I saw through his trick’.

Here the preposition is used through where it is used a medium for visibility of the inner significance of the plan.

With the word through inserted in the sentence, it gets a clarity and a definite meaning.

Here the word through is used as the synonym of the word ‘via’ or ‘thru’.