When he climbed a tall tree to save a little girl, he risked ________ off it and ________ his legs, but he landed safe in the end．A.falling; breakingB.to fall; breakC.falling; breakD.to fall; broke
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A解析考查动词句型risk doing sth．。从下文中可知道的他的腿没有受伤，所以后面是平行结构，break是和fall并列作risk的宾语。