Father must _ left his briefcase at the office.
Correct answer: C. Have
- A. Of
- B. Had
- C. Have
- D. None of these
Explanation
We use "must-have" in the present perfect - the action we are describing happened, or did not happen, in the past and is still true in the present.
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About Infinitives and Gerunds
Infinitives use to plus the base verb, while gerunds use the -ing form as nouns. The topic covers their functions as subjects, objects and complements, bare infinitives after certain verbs, verb patterns such as enjoy reading and want to read, and the difference between gerunds and present participles.
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