[ Grammar ]
The circus ________ 20 minutes ago.
A. begin
B. begins
C. began
D. begun
Select your answer:

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Tenses › ViewI (see) her before somewhere- I (know).
A. had seen/ knew
B. saw/ had known
C. saw/ knew
D. had seen/ had known
Grammar › View
Alexander Fleming ________ penicillin.
A. was discovering
B. discovered
C. discovers
