I WOULD HAVE LEFT IT I _______ YOU ARE NOT COMING.a.HAVE KNOWNb.KNEWc.KNOWd.HAD KNOWN

To choose the correct option for the sentence "I WOULD HAVE LEFT IT I _______ YOU ARE NOT COMING," we need to analyze the structure and tenses used in it.

1. Understanding the Sentence Structure

The phrase "I WOULD HAVE LEFT IT" indicates a hypothetical situation in the past that did not happen, usually followed by a conditional clause that explains the condition.

2. Analyzing the Options

• a. HAVE KNOWN: This form is incorrect because it doesn't match the past conditional structure.
• b. KNEW: This is simple past and implies a completed action but isn't suitable for the conditional form here.
• c. KNOW: This is present tense and would not fit in the context as it doesn't reflect a past hypothetical situation.
• d. HAD KNOWN: This past perfect form is appropriate for the conditional context, indicating that if the condition had been fulfilled in the past, the action would have occurred.

3. Conclusion

The correct choice to fill in the blank is d. HAD KNOWN.

Final Answer

"I WOULD HAVE LEFT IT I HAD KNOWN YOU ARE NOT COMING."