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—Look!He’s running so fast!

—Hard to________his legs were once broken.

A.know B.imagine C.realize D.find

 

B

【解析】考查动词的意思。句意为:——看!他跑得那么快!——很难想像他的腿从前断过。know知道;imagine想像;realize意识到;find找到,发现。

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