英语语法必采纳

主语+动词+宾语从句（how引导），从句用陈述句语序，D是疑问句语序，所以不选D

【一句话，特殊疑问句做宾语用陈述句语序】
一、在引导词上，要将疑问代词或疑问副词变为连接代词或连接副词，引导宾语从句。如：

Whose bike is this？Does anybody know？
→ Does anybody know whose bike this is？

二、宾语从句的时态应与主句的时态保持一致。如：

When the train will arrive？He asked me．
→ He asked me when the train would arrive．

三、在语序上，要将疑问句语序改为陈述句语序。如：

Which one do you like best？She askedme．
→She asked me which one I liked best．

【注意】
疑问句中主语之前的助动词若是do／does ／did，变为宾语从句时，
要先将其去掉，谓语动词再根据时态作相应的变化。

四、特殊疑问词在句中作主语，变为宾语从句时语序不变（时态应作相应变化）。如：

Who can answer the question？
The teacher asked．
→The teacher asked who could answer the question．

五、
特殊疑问句变为宾语从句后，用问号还是用句号完全取决于主句的句式：
如主句为陈述句、祈使句，句末就用句号；如主句是疑问句，句末就用问号。如：

I don't know when we shall start tomorrow．

Do you know when we shall start tomorrow？