16. He had already learned the news. I _
题型:选择题
问题:
16. He had already learned the news. I ______ the trouble to phone him about it.
A.needn't have taken
B.could have taken
C.should have taken
D.mustn't have taken
16. He had already learned the news. I ______ the trouble to phone him about it.
A.needn't have taken
B.could have taken
C.should have taken
D.mustn't have taken