Either the ways or the time________ yet,   but you may ask the headmaster for some information. [      ]

A. isn't decided  

B. hasn't decided

C. aren't decided  

D. haven't decided

女性，43岁。因多饮、多食、多尿、口干、消瘦6个月，一月前出现情绪低落、兴趣减退、乏力、易流泪等症状，曾流露过轻生的念头。自诉既往体健，从未生过病。

对帮助诊断最有价值的检查项目是

A．甲状腺功能检查

B．空腹血糖检测

C．ECG检查

D．血氨检查

E．Hamilton抑郁量表评定