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

．Walking alone in the dark，the boy whistled to his courage.
A. hold up
B. keep up
C. set up
D. take up

A. hold upB. keep upC. set upD. 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。

和我的回答一样，看来我也对了