[ Modals ]
Umberto _ _ _ _ _ _ to go out because he’s just gone to bed.
A. can’t be planning
B. can’t plan
C. must be planning

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Past Tense › ViewI didn’t used to ____ a lot.
A. read
B. reading
C. readed
Tenses › View
By the time I left, she __________ for more than an hour.
A. had been studying
B. studies
C. has been studying
D. was studying