问题补充：
The weather turned out to be fine yesterday. I the trouble to carry my umbrella.
A. needn’t take
B. couldn’t take
C. needn’t have taken
D. couldn’t have taken
答案：
A. needn’t take
B. couldn’t take
(答案→)C. needn’t have taken
D. couldn’t have taken
解析：句意:昨天的天气证明是晴天，我没有必要麻烦带着一把雨伞。这里是对过去的虚拟，needn’t have done指过去没有必要做某事而做了，故选C。
