问题
选择题
Walking alone in the dark, the boy whistled to ________ his courage. [ ]
A. hold up
B. keep up
C. set up
D. take up
答案
答案：B
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Walking alone in the dark, the boy whistled to ________ his courage. [ ]
A. hold up
B. keep up
C. set up
D. take up
答案：B