[ Grammar ]
The __________ scientist continued his research despite the challenges.
A. passionate
B. determined
C. primitive
D. persistent
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Grammar › ViewPeter and Jane _ chess during their free time.
A. play
B. plays
C. playing
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Joe practices aikido every day, which is why he _____ win the competition last month.
A. can
B. can’t
C. could
D. couldn’t