[ Modal Verbs ]
My back has been hurting for weeks. I__________go to the doctor’s.
A. don’t have to
B. have to
C. mustn’t
D. must

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Root WordHabitual and Continuous TensesPerfect Progressive TensesGerunds as Objects of PrepositionsGrammar and EssayIndefinite and Reflexive PronounsVerbal CommunicationOffer and SuggestionVerb BEVerb to haveOther quiz:
Plural › ViewMany _________ (monkey)
A. Monkies
B. Monkey
C. Monkeys
Present Simple for Future Arrangement › View
I _____ from Phnom Penh at 8am.
A. depart
B. arrive