Father must _ left his briefcase at the office.
Correct answer: C. Have
- A. Of
- B. Had
- C. Have
- D. Opt
Explanation
We use must have + past participle when we are sure of what happened. Hence "must have" is correct. 'Of' is used to show ownership or a distance from something or a result coming from something. As the sentence is not in the third person singular, 'has' is not used. 'Are' is used for plural nouns, which is not the case in this sentence ('Father' is singular). 'Opt' is used to make a choice, especially of one thing or possibility, instead of others. In this case, the briefcase is an essential item and is necessary.
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About Prepositions
Prepositions link a noun or pronoun to the rest of the sentence, showing place, time, direction or relation. The difficulty is idiomatic rather than logical: English fixes particular prepositions to particular verbs and adjectives, so “good at,” “married to” and “differ from” have to be learned as units rather than reasoned out.
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