Had the transport authority ______ the warning about flash floods, the highway would have been closed proactively.
Answer and explanation
Correct answer: D. heeded
- Step 1: Recognize inverted conditional structure: 'Had + subject + past participle' replaces 'If the authority had...'.
- Step 2: The past participle form of the verb 'heed' is 'heeded'.
Answer
heeded.
Why not the others: 'heed' is base form; 'heeding' is present participle; 'heeds' is third-person present.
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