It was very kind of you to clean the office, though you___

问题描述:

It was very kind of you to clean the office, though you___
A needn't doB wouldn'thaveC didn'thave toDmustn'thave done 选哪个,为什么现那个.谢谢

选c 句子意思是,你人真好啊帮忙打扫办公室,尽管你不用必须去做.为什么选C啊,能说的再详细些吗,谢谢句子开始it was....说明是过去时态,那么根据时态排除A,B选项一般用于过去将来完成时,排除。D选项中要注意must 一定的意思,但是变成must't 意思不是must的否定。而是表示禁止什么....