问题补充:
.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:
A. hold up
B. keep up
C. set up
D. take up
解析:B
解析句意为:独自在黑暗中行走,男孩吹口哨保持勇气。B项意为“维持,使不低落”,符合句意。A项意为“举起”;C项意为“建立”;D项意为“拿起”,都与句意不符。
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