A.Entered; seat
B.Entering; seated
C.To enter; sitting
D.Entering; seating
第1题:
A light used to signal passing intentions must be an ______.
A.all-round yellow light only
B.all-round white light only
C.all-round blue light only
D.alternating red and yellow light
第2题:
第3题:
Hall三维结构的具体内容是什么?
第4题:
第5题:
第6题:
2、Hall三维结构的具体内容是什么?