---Everyone was at the party except you. What happened?

---I      after Mike, my pet dog, at home. He was ill.

A．have looked

B．was looking

C．would look

D．had looked

建设工程（产品）及其生产的特点包括（）。

A.产品的固定性

B.生产的流动性

C.产品多样性

D.生产的单件性

E.生产无外部约束