单选题 Only after a baby seal is pushed into the sea by its mother ______ to swim.
A. how will it learn B. will it learn how
C. it will learn how D. and it learns how

【正确答案】 B
【答案解析】[解析] 以only引导的状语放在句首时，句子需用部分倒装句序，即将be动词或助动词放在主语前面。