l don't understand --- that everything's fine when it's nota\ how can he sayb\ can he say howc\ he can say howd\ how he can say请说明理由好吗?

l don't understand --- that everything's fine when it's nota\ how can he sayb\ can he say howc\ he can say howd\ how he can say请说明理由好吗?
l don't understand --- that everything's fine when it's not
a\ how can he say
b\ can he say how
c\ he can say how
d\ how he can say
请说明理由好吗?

l don't understand --- that everything's fine when it's nota\ how can he sayb\ can he say howc\ he can say howd\ how he can say请说明理由好吗?
选D
how he can say是宾语从句 做的是understand 的宾语 要用陈述句语序 意思是我不明白 他怎么能说一切都好
既然用一个句子作宾语 你不妨把句子看成整体
理解成
I don't understand XX
就是我不能理解XX
把XX 换成用句子表达的事情就好理解了

选择d，一般从句的语序是正常的，只有特殊的比如 how many 什么的才用疑问句式。。望采纳 谢谢