【正确答案】 B

【答案解析】[解析] however作关系副词引导让步状语从句时，该词修饰的形容词或副词要和 however一起移到从句句首，例如：However hard the task maybe，we must fulfil it on time．不管任务多么艰巨，我们都必须按时完成。However hard she tries，she can not understand what you mean．无论她怎么努力，也弄不明白你的意思。though在引导让步状语从句时，从句内容可以倒装也可以不倒装，倒装时，必须将需倒装成分置于从句句首，例如：Though they were going to part，they trusted each other．尽管他们就要分离，但他们都彼此信任。Much though I like ice-cream，I never eat too much at once．尽管我很喜欢吃冰淇淋，但是我从不一次吃得太多。