The students were so _______when they heard the _______news.

A．frustrating, frustrated

B．frustrated, frustrating

C．frustrated, frustrated

D．frustrating, frustrating

在前置胎盘与胎盘早剥中，下列选项不正确的是（）.

A.胎盘早剥出血，伴有疼痛

B.胎盘早剥时胎心音可有变化

C.前置胎盘的出血于宫缩时增多

D.胎盘早剥的出血于破膜后即停止

E.前置胎盘出血不多时一般不影响胎心