Lucy has a great sense of humour and always keeps her colleagues with her stories.
A. amused
B. amusing
C. to amuse
D. to be amused
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(答案→)A. amused
B. amusing
C. to amuse
D. to be amused
解析：keep +宾语+宾补。宾补可以由形容词充当，amused， amusing 都可作形容词但是amused 修饰人；amusing修饰物。“露西有幽默感总能使得同事们笑”所以选A。