[ Passive Voice ]
These curtains are so dirty. They must ____ .
A. be cleaned
B. clean
C. cleaned

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Who vs WhomPast ContinuousAuxiliary Verbs & Question TagsModals for ObligationSimple Present Continuous TenseSecond ConditionalAdjective + to + VerbPassive Modals in Different TensesModals - Conditionals - Future TensesPreposition FormOther quiz:
Tenses › ViewThe service center ____ vehicles right now, during the busiest hour.
A. is repairing
B. repaired
C. repairs
D. will repair
Sentence Structure › View
Yadriel went to the beach, ___ he learned to surf.
A. or
B. and
C. but
D. for