We _______ at the house as we _______ of buying it.

A．looked; were thinking

B．looked; had thought

C．were looking; thought

D．were looking; were thinking

AU指针的作用是（）。

A.指示高阶VC首字节在AU净负荷中的位置

B.指示低阶VC首字节在TU净负荷中的位置

C.对低阶VC进行速率适配