— How are you today?

— Oh, I _____ as ill as I do now for a very long time. [ ]

A. didn't feel

B. wasn't feeling

C. don't feel

D. haven't felt

患者女，78岁，因“体检时超声发现肝内肿物1d”来诊。无不适。无肝病史，4年前曾有一次心肌梗死病史。肝脏超声：可疑肝右叶内实性肿物，边界不清楚，范围约4.5cm×4.0cm，内部回声不均匀，中部回声略高，未见明显血流信号。为了明确诊断需要进一步检查。

如果选择超声造影，下列叙述错误的是（）.

A.造影前必须进行心功能检查

B.左心室射血分数（LVEF.50%是超声造影的禁忌证

C.增强CT不比超声造影更安全

D.该患者符合超声造影的适应证

E.超声造影对诊断有较大帮助