--- I'd cooperate _ you.

The correct answer is If I had much money....with because it uses the conditional form appropriate for discussing hypothetical situations in the past or present.

Here's a breakdown of why this option is correct:

    
• "If I had" refers to a situation that is not real—it's about something that could happen under certain conditions.
    
• "Much money" indicates the condition that needs to be met for cooperation to occur.
    
• "...with" correctly completes the thought of cooperating.

Other options are incorrect because:

    
• Option b: "Had I had much money...at" uses an incorrect structure for the intended meaning.
    
• Option c: "If I have much money ...with" suggests a real and present situation, which is not the context.
    
• Option d: "Had I have much money ...with" contains a grammatical error in tenses.

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