当肾病患者的血浆尿素氮和肌酐开始升高时,内生肌酐清除率至少降低()
A.10%
B.50%
C.30%
D.40%
E.20%
参考答案:B
All the club members _____ the floor when they heard someone _____ for help.[ ]
A. swept; were shouting
B. swept; shouted
C. were sweeping; shouting
D. were sweeping; shouted