单项选择题

Nancy had (a great deal) of trouble (to concentrate on) her work (because of) the noise (in) the next room.

A．a great deal of
B．to concentrate on
C．because of
D．in
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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
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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