We _______ go to the park last Sunday. He isn't wrong.
A:do
B:did
C:does
D:doing
如图是小明用火柴搭的1条、2条、3条“金鱼”…,则搭n条“金鱼”需要火柴____根.
下列水平放置的几何体中,俯视图是矩形的是( )