问题补充：
Only after a baby seal is pushed into the sea by its mother to swim.
A. how will it learn
B. it will learn how
C. will it learn how
D. and it will learn how
答案：
A. how will it learn
B. it will learn how
(答案→)C. will it learn how
D. and it will learn how
解析：only加状语提到主句前面时，主句中主语和谓语用部分倒装。
