[ Grammar ]
“ How long is the seminar ?”
“ ———— knowledge, it takes about three hours.”
A. To my best
B. To the best of my
C. In my best of
D. In my best
Select your answer:

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Grammar › ViewShe’s been studying _____ her final exams for weeks.
A. for
B. since
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He used to _________ very shy until he gained confidence.
A. Be
B. Being
