___all the students are here,why don't we start at once?

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/04/28 18:56:50

___all the students are here,why don't we start at once?
A.As soon as
B.After
C.Since
D.When
急.说下原因.

我觉得应该选择C
since的用法主要有两点：一是表示“自从……以来”,二是表示“既然”之意
在此句中就是“既然”的意思.强调已知的事实
既然所有的学生都在这儿了,我们为什么不立刻出发呢?
例：Since you can't answer the question,I'll ask someone else.
既然你回答不出这个问题,我就问别人了.
As soon as 意思是“一……就……”
I will tell him as soon as I see him.我一看到他就会告诉他.
I'll write you as soon as I get there.我一到那儿,就给你写信.
when 从句表示某时刻或一段时间
例如：Sorry,I was out when you called me．
对不起,你打电话时我刚好外出了.

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