[ Grammar ]
James used to be a careless driver. ______ he had a car accident did he know the importance of careful driving.
A. After
B. It was not until
C. Until
D. Not until

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Grammar › ViewI didn’t expect______________the match as much as I did.
A. enjoying
B. enjoy
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The team ____ research for years, and they usually ____ their findings at conferences.
A. conducts / has presented
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You……………be careful when you cross the street.
A. must
B. mustn’t