问：大全581

1.        Piaget’s research revealed that children can learn to count long before the recognition that a pint of water poured from a small glass into a large one remains the same amount of water.

(A) the recognition that

(B) they can recognize that

(C) they would recognize

(D) they could have the recognition of（B）

(E) having the recognition of

答案是B，A为什么不对，好像更简洁的说。。。

before后面一般是句子和动词-ing形式哦

动词优先抽象名词。

而且A的recognition没有动作发出者。