Grammar: Nobody knows what happened. The fire ____ been ...

[ Grammar ]

Grammar:

Nobody knows what happened. The fire ____ been an accident or caused on purpose.
_____
A. could have

B. must have

C. should have

Select your answer:

Random Topics:
Adverb of Manner Countable Quantifiers Modals and Past Tenses Infinitive Forms Future Perfect Continuous Active vs. Passive Voice Can, Could, May, Might Subordinate Conjunctions Wh Questions

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