[ Modal Verbs ]
I ….. open this window! i think it’s stuck
A. can
B. might
C. can’t
D. must

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Grammar › ViewYou ….. .… …… “No” to the stranger’s invitation on Facebook.
A. could say
B. could have
C. could have say
D. could have said
Vocabulary › View
What does “finality” mean?
A. Indecision
B. Completeness
C. Uncertainty
D. Reversibility