B
宾语从句如果是疑问句不需要倒装,用正常语序
how can I （I是主语,can是情态动词,动词在主语前是倒装）,是疑问句的语序不对
what is wrong with your watch what-主语,is-谓语,wrong-表语,主系表是正常陈述句语序,正确D为什么不正确there are XX boys 本来就是一种倒装语序，boys是主语，are是谓语，there是表语应该变成：how many boys are there才是正常语序