问题补充：
It was fine yesterday so I the trouble to carry my raincoat with me.
A. don’t need to take
B. mustn’t have taken
C. didn’t need to take
D. needn’t have taken
答案：
A. don’t need to take
B. mustn’t have taken
(答案→)C. didn’t need to take
D. needn’t have taken
解析：考查need的用法：句意：昨天天很好，所以我不必费事带雨衣。因为是昨天的事情，用过去时，didn’t need to do，A项的时态错误，Bmustn’t不能用于+have done的结构，D。needn’t have done本不必做而做了。都不符合句意。选C。
