Complete the sentence: Had the hydrological engineers ______ the flash flood warning system earlier, the valley settlements would have avoided inundation.
Answer and explanation
Correct answer: B. installed
- Step 1: Identify conditional inversion: 'Had + subject + past participle' represents an inverted third conditional (replacing 'If the engineers had installed').
- Step 2: Determine required verb form: The auxiliary 'Had' requires the past participle form of the main verb.
- Step 3: Select 'installed'.
Answer
installed.
Why not the others: 'install' is base form; 'installing' is a present participle; 'have installed' creates an ungrammatical double auxiliary construction.
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