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
The old artist is (in the habit of) (going for) a walk in the park every (morning) (except it rains).
A. in the habit of
B. going for
C. morning
D. except it rains
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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