It would be a risk to let the child go to school by himself.
A. following
B. passing
C. running
D. carrying
网友回答
A. following
B. passing
(答案→)C. running
D. carrying
解析： run(take) a risk 冒风险：You are running a big risk in trusting him.(你信任他是冒极大的风险。) by oneself(=alone)单独，独立地。