. Once your business becomes international, _____ constantly will be part of your life.

A．you fly

B．your flight

C．flight

D．flying

学生在校期间依法履行下列义务（）：1.遵守宪法，法律，法规；2.遵守学校管理制度；3.努力学习完成规定学业；4课外兼职，积累经验

A.1.2.4

B.1.3.4

C.2.3.4

D.1.2.3