Walking alone in the dark，the boy whistled to his courage.A. hold upB. keep upC. set upD.

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A. hold up
(答案→)B. keep up
C. set up
D. take up
解析：考查动词短语辨析。句意：独自在黑暗中行走，男孩吹口哨保持勇气。B项意为“维持，不使低落”，符合句意。A项意为“举起”；C项意为“建立”；D项意为“拿起”。