The weather turned out to be fine yesterday. I have taken the trouble to carry my umbrell

问题补充：

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

答案：

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。