[ Tenses ]
Why …. they laughing so hard?
A. were
B. did
C. have
D. been
Select your answer:
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Grammar Modals › ViewClimate change could _____ the survival of blue whales.
A. being threat
B. threaten
C. have been threatened
D. threat
Subject Verb Agreement › View
I __________ a nice pen.
A. has
B. have