—Tom, it seems that you haven’t cleaned your bedroom the whole week .

—You didn’t come in around 10 yesterday morning; I ________ it .

A．cleaned

B．have cleaned

C．was cleaning

D．had cleaned

织物的保温性决定于（）。

A.纤维的导热系数

B.纱线的结构

C.织物的组织结构

D.织物的透气性