题目内容：

---We’ve decided to visit our mother school this afternoon.Are you going with us?
--- Well,____ you are going,so will I.
A when B since C if D while
为什么答案是since

优质解答

since这里是既然的意思.
不选if, 因为上面已经说了他们会去
不选when,已经说了是下午去.
while是指一段时间