Question

I could see ......his plan the moment he refused to divulge the details

Answer 1

as his plan
I think so

Answer 2

Answer:

The complete sentence would be -

"I could see past his plan the moment he refused to divulge the details".

A preposition represents the relation between a pronoun and a noun and a word or another element. While using a preposition, listening to whether it sounds right with the statement or not is important. Whether it’s making any logic or not is also important. Here, past means to the other side of something. In other words, "I could see on the other side of his plan the moment he refused to divulge the details".