—Physics is an important subject isn’t it ?—Yes. it well and you’ll find it useful in you

问题补充：

—Physics is an important subject, isn’t it ?

—Yes. it well and you’ll find it useful in your daily life.

A. Learning

B. Learn

C. Learned

D. To learn

答案：

A. Learning

(答案→)B. Learn

C. Learned

D. To learn

解析：句意:-物理是一门重要的学科，是吗？-是的。学好物理，你会发现在你的日常生活中它很有用。句中and 这个连词连接的是两个并列的句子，其句型是祈使句+ and +简单句。故本空应用动词原形。故选B。