The key lies in the fact that the untis of meaning The key lies in the fact that the untis of meaning? The answer is lies. I chose rides. I want to know why lies is used instead of rides?

The key lies in the fact that the untis of meaning The key lies in the fact that the untis of meaning? The answer is lies. I chose rides. I want to know why lies is used instead of rides?

I haven't heard of the phrase hide in
Then, lie in means lie in
What's more, your sentence is a sick sentence. It's not a complete sentence and can't appear as a clause

the difficulty lies _____ we have no money.A in that B in the fact that
A is the object clause of the preposition "in". Although "that" generally does not lead the object clause of the preposition, "in but except" can be followed by "that"
B is the appositive clause guided by that, the fact is the antecedent, and that clause explains the content of fact
Please tell me what to choose, why and why

The answer is in the fact that
That as the object of preposition is only used in the two structures except that and in that, while in is the collocation of lie in, that cannot be used after lie in
In answer B, the fact is the object of lie in and that is the appositive of the fact

4.The difficulty lies in _____ we have no money.A.that B.which C.the fact D.the fact that
Why can't you choose B

Which is used in the attributive clause, in which there is no object after lies in, so we can't use B as the object directly