Topics: Tenses
I ______ her since I _____ a student.
A. know/ am B. knew/ was C. have known/ am D. have known/ was
A. know/ am
B. knew/ was
C. have known/ am
D. have known/ was
Select your answer:
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A. a
B. an
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YouTube ____ to become the world most popular video-sharing website since 2005.
A. has grown
B. have grown
C. grew
D. grows