红细胞沉降率测定时，抗凝剂与血液的比例为（）。

A.1：4

B.1：2

C.1：9

D.4：1

E.9：1

I can’t go to the New Year’s concert,_____,100 dollars is just too much for me to spend in one evening.

A．in other words.

B．that is.

C．in particular.

D．I mean