I don't know whether you happen _____, but I'm going to study in the U.S.A this September. [ ]

A. to be heard

B. to be hearing

C. to hear

D. to have heard

()烟草专卖品的生产环节包括卷烟、雪茄烟、烟叶、烟丝、复烤烟叶、卷烟纸、滤嘴棒、烟用丝束的生产。