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：动词短语辨析。A举起，支持；B保持；维持；激发；C建立，成立；D占据，从事于；开始做；句意：独自一人走在黑暗的街上，那个男孩吹起口哨来鼓起自己的勇气。故B正确。