Having arrived at the station, _____.

A．it was found that the train had left

B．the train had left

C．the train was found left

D．he found that the train had left

TDM时的标本采集不正确的是（）

A.常以血清或血浆为检测标本

B.准确记录用药和采集标本的时间

C.出现药物中毒症状时应在出现症状之后采集标本

D.要掌握所监测药物的药代动力学

E.长期应用的药物应在血药浓度达到稳态时采集标本