A:were using
B:are used
C:were used
D:are using
What _______ your favourite day?( )
— I like this dress, Mum.
如图所示,墙壁上线盒内有三根电线,其中红色为火线、蓝色为零线、黄绿色为地线,现将三孔插座与三根电线连接,图中接线情况正确的是( )