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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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
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
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