[ Past Modals ]
The movie theater _______________ full because there were still tickets for sale.
A. could have been
B. must not have been

Random Topics:
Must Vs Have toPreference & Future TenseAdverbs and Time ExpressionsPassive Voice - Present Simple and Past SimplePresent Perfect Simple and ContinuousPast Simple, Past Continuous, Past Perfect, Past Perfect ContinuousGerund Subject or ObjectPast simple - Irregular VerbsThe Present Progressive TenseTenses and QuestionsOther quiz:
Grammar › ViewDid you …… in the Mt Bromo yesterday?
A. Go
B. Goes
C. Went
D. Gone
Vocabulary and Grammar › View
He is driving so fast: he may endanger other_______.
A. means of transport
B. road users
C. zebra crossing
D. railway station