The lights are on, so they ______ be at home.
Answer and explanation
Correct answer: D. must
- Step 1: 'Must' expresses a strong deduction from the evidence.
Answer
must.
Why not the others: "needn't" is wrong because 'needn't' means no obligation. "mustn't" is wrong because 'mustn't' means prohibition. "can't" is wrong because 'can't' would contradict the evidence of the lights.
Practise more Passives, gerunds, infinitives and modals.
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More Passives, gerunds, infinitives and modals questions
- The new bridge ______ by the mayor next year.
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