Don’t copy others’ work. If you do it by you’ll feel much better.A. you B. yourC. itself

问题补充：

Don’t copy others’ work. If you do it by , you’ll feel much better.

A. you

B. your

C. itself

D. yourself

答案：

A. you

B. your

C. itself

(答案→)D. yourself

解析：do sth by oneself，某人自己做某事，本句是祈使句，因而后文用yourself，故选D