Had Peter ________ about the road closure earlier, he would have taken a different route to the airport.
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Worked Solution
Step 1: Identify the sentence structure. This is an inverted third conditional (If Peter had known...).
Step 2: In this structure (Had + Subject + Past Participle), the past participle of 'know' is required.
Step 3: The past participle of 'know' is 'known'.
Correct answer: known
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