Walking alone in the dark, the boy whistled to________his courage. A. keep up B. hold up C. take up ...
2022-10-03 14:16:44 17次 江苏省高中英语选修六牛津译林版练习题：Unit 4 Helping people around the world 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Walking alone in the dark, the boy whistled to________his courage.
A. keep up B. hold up
C. take up D. set up
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