药物鉴别反应

维生素B₁

A．加酸产生白色沉淀
B．与硝酸银反应产生黑色沉淀
C．麦芽酚反应
D．硫色素反应
E．三氯化锑反应

Bill asked his father _____ and play football.[ ]

A. let him to go    

B. let him to    

C. to let him go    

D. to let him to go