[ Tenses ]
They …… frustrated when the students did not engage with the new rewards system.
A. must be
B. must was
C. must have been
D. must had been
Select your answer:
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Es and S › ViewJustin Bieber ____ famous.
A. are
B. is
C. am
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At the pool, they _______ there every Friday.
A. go
B. goes
C. went
D. gone