The weather turned out to be fine yesterday. I have taken the trouble to carry my umbrella with me.
A. should
B. could
C. needn’t
D. mustn’t
网友回答
A. should
B. could
(答案→)C. needn’t
D. mustn’t
解析：考查情态动词用法。Should have done本应该做某事，实际上却未作；could have done本可以做某事，实际上却未做；needn’t have done本不需要做某事，实际上却做了；句意：昨天的天气结果却很好，我本不需要一直都带着雨伞的。根据句意说明C正确。