题目内容：

5.51
beneath each of the following sentences there are foyr choices marked
A.B.C.D.choose the one answer that is closest in meaning to the sentence
angry as he was ,he couldn't saying so
a.he was too angry to say so
b.he was too angry not to say so
c.he was so angry that he didn't say so
d.though he was angry,he said so