Although it is painful to watch him struggling with the difficulty, it is probably better to _______ unless he asks for help. A、 stay on the sidelines B、 stand still C、 stay back D、 stand in the way

Although it is painful to watch him struggling with the difficulty, it is probably better to _______ unless he asks for help.
A、
stay on the sidelines

B、
stand still

C、
stay back

D、
stand in the way

出自：河北农业大学大学英语Ⅳ

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