[ Grammar ]
He couldn’t rest or sleep because _________________ too much coffee.
A. drinking
B. been drinking
C. had been drinking
D. he had been drinking

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A. lost
B. have lost
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We …… her since last Christmas.
A. haven’t seen
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This is definitely not John’s pen, his isn’t black.
This ______ John’s pen, his isn’t black.
A. won’t be
B. can’t be
C. isn’t
D. mustn’t be
