[ Grammar ]
Susan has to work very hard. I _______________ do her job, I’m sure.
A. can’t
B. couldn’t
C. shouldn’t
D. mustn’t

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VerbsSimilesPast Simple - Present PerfectSubject-Verb AgreementDegrees of AdjectivesTenses - AuxiliariesExclamationPassive Modals in Different TensesPast TenseAdverb of Frequency and TensesOther quiz:
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