要建造一座房子,四面的窗户都对着北方,你认为应该建在( )
A:北极点上
B:赤道和0°经线的交叉点上
C:南极点上
D:赤道和180°经线的交叉点上
Ben was busy taking a training class, ________ we had to wait for him for half an hour.