[ Perfect Tenses of Verbs ]
Elizabeth has spent the past three hours in the library.
A. present perfect
B. past perfect
C. future perfect
Select your answer:
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Verb › ViewWhich word is the verb.
Mothers chat on the path.
A. On
B. Chat
C. Mothers
D. The
E. Path
Modals of Deduction › View
Tom has been working late every day; he __________ be very busy with a project.
A. must
B. might not
C. can’t