–Would you mind _________ your voice down? We are doing our homework.

–Sorry for that.

A．keep

B．keeping

C．to keep

D．kept

患者男性，45岁。因四肢对称性无力，伴肢体袜套样感觉异常入院检查。患者3周前有上呼吸道感染。对此患者，最有助于诊断的辅助检查是（）

A.头颅CT

B.脑血管造影

C.脑脊液检查

D.脑电图

E.体格检查