[ Modal Auxiliary Verb ]
‘Rita has just missed the pane to Medan.’ ‘She … at the airport at least two hours before departure.’
A. was
B. should be
C. should have been
D. has to be
E. must have been

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Modal Verbs › ViewYou ______ have to pay in cash, as we do not accept credit cards.
A. could
B. can
C. should
D. will
Grammar › View
plastic bottles are usually ___________
A. rechargeable
B. recyclable