Grammar Quiz

[ Grammar, Conditional Sentences, Vocabulary ]

He ________ the jewels unless he had had inside help.

A. could not have stolen

B. could have stolen

C. has stolen

D. will not have stolen

Select your answer:
         


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Who vs WhomPhrase vs ClauseRelative & ModalsGrammar - Present Perfect TenseAuxiliary WordsModals of PredictionPresent Tenses: Simple vs ContinuousFuture - be going toConditionals

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