下列哪一项检测结果表明胎儿或胎儿器官已成熟（）

A.B超测得胎头双顶径值为8cm

B.羊水中US为1.8

C.羊水中肌酐值为180μmol/L

D.羊水中胆红素类物质值为0.05

E.羊水中淀粉酶值为400U/L

--Is everything __ we need to do __?

--Yes. You needn’t worry about it.

A．which; has done

B．which; doing

C．that; has done

D．that; done