单项选择题

Dr. Nolen was honest enough to admit to make errors in judgment on more than one occasion.()

A. honest enough
B. to make
C. in
D. on

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单项选择题

Not until my mother told me the sad news last night I knew that our neighbor was killed in a car accident the week before.()

A. Not until
B. the sad news
C. I knew
D. was killed

单项选择题

Ever since the world began nations have difficulty in keeping peace with their neighbors.()

A. Ever since
B. began
C. have difficulty
D. keeping

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