Mr．White         to hospital for an examination yesterday but he was too busy to come．

A．should come

B．should have come

C．should be coming

D．should had come

公司建立材料价格数据库，把控分供合同价格离散度，要求同地域、同品牌、同规格、同质量、采购时间相近的材料，离散度小于（）。

A.5%

B.8%

C.10%

D.12%