[ Verb Tenses ]
Identify the tense: I have been studying for three hours.
A. Future continuous tense
B. Past perfect tense
C. Present simple tense
D. Present perfect continuous tense

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Grammar › ViewAnna doesn’t ________Art on Thursdays.
A. has
B. have
C. had
Modal Verbs & Perfect Infinitive › View
. She looks sad. She …….. something upsetting on social media.
A. must have seen
B. can’t have seen
C. must see