I stayed up late doing my homework yesterday, so I had trouble _____ up early this morning.

A．get

B．getting

C．got

D．to get

关于胸部创伤的描述，下列正确的是（）

A.常不伴有心肌挫伤

B.2%伴有心肌挫伤

C.5%伴有心肌挫伤

D.8%伴有心肌挫伤

E.12%伴有心肌挫伤