Good heavens! There you are! We＿＿anxious about you, and we ＿＿you back throughout the night.

A．are； expect

B．were； had expected

C．have been；were expecting

D．are； were expecting

空间有一平面，在W面投影依旧为一平面，H面的投影为一直线且平行于Y轴，则该面是（）。

A.水平面

B.正平面

C.侧平面

D.都不是