题目
On hatching,______
A.young ducks know how to swim B.swimming is known by young ducks
C.the knowledge of swimming is gained by young ducks
D.how to swim is know in young ducks
选什么?为什么?
A.young ducks know how to swim B.swimming is known by young ducks
C.the knowledge of swimming is gained by young ducks
D.how to swim is know in young ducks
选什么?为什么?
提问时间：2021-02-25
答案
选A．ON HATCHINGY应该表示刚被孵化出来,整句话（加上选项）就是小鸭子一被孵化出来就会游泳．所以是”小鸭子被孵化”,”小鸭子会游泳”主语应该都是小鸭子才不别扭．
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