Alice, bent losing weight, increased the time of exercise to three hours a time.
A. on; in
B. on; for
C. with; for
D. with; at
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A. on; in
(答案→)B. on; for
C. with; for
D. with; at
解析：考查固定短语。Be bent on热恋于;for a time暂时，一度；at a time一次。.句意：热恋于减肥的Alice,一度把锻炼的时间增加到三个小时。