It is amazing that the little boy can swim the river 100 meters wide.Aacross;measuringB．o

问题补充：

It is amazing that the little boy can swim the river 100 meters wide.A．across;measuringB．over;measuredC．across;measureD．through;measuringA

答案：

(答案→)A

解析：从河的这边游到那边用across；measuring此处作定语修饰river，是不及物动词，意为“测量起来，计算起来有……长”，后面接数字。