If I had known how difficult the job was, I ......... taken it .

The correct answer is wouldn't have because it fits the conditional structure of the sentence. In this context, the speaker is expressing a situation that did not happen in the past. Here’s a brief explanation:

    
• Conditional Structure: The phrase "If I had known" indicates a past hypothetical situation. The speaker is reflecting on a past condition that was not fulfilled.
    
• Negative Form: "Wouldn't have" is the negative form of "would have," suggesting that if the speaker had known about the difficulty, they would have chosen not to accept the job.
    
• Other Options: The other options ("would not," "hadn't," "will not") do not adequately complete the sentence in a grammatically correct way for expressing past hypotheticals.

Thus, "wouldn't have taken it" correctly conveys the intended meaning of regret over a past decision.

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