[ Modal Verb ]
I didn’t see Mary at the party, so she ___________there.
A. can’t have been
B. couldn’t be
C. shouldn’t have been
D. mustn’t have been

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Grammar › ViewThe two _____ in the film know the art of self-defence.
A. hero
B. heros
C. heroes
D. herows
Grammar › View
Steve felt ____ as he walked alone in the park at night.
A. frightening
B. frightened
C. fright
D. frighten