A how much cost they are B how much do they cost C how much they cost D how much are they cost.我搞不清楚BC的区别,希望明白的人给我讲明白些.

A how much cost they are B how much do they cost C how much they cost D how much are they cost.我搞不清楚BC的区别,希望明白的人给我讲明白些.
A how much cost they are B how much do they cost C how much they cost D how much are they cost.我搞不清楚BC的区别,希望明白的人给我讲明白些.

A how much cost they are B how much do they cost C how much they cost D how much are they cost.我搞不清楚BC的区别,希望明白的人给我讲明白些.
如果是单独的一个问句则用B不能省略助动词do,如果作为从句,就要省略助动词,还要改成陈述语序.

你题目没有打出来，所以我只能说，如果原题是宾语从句应该用陈述句语序，选C.如果是单纯的疑问句则用疑问句语序，即助动词提前，选B

B属于一个独立的疑问句：他们花多少钱？
C不是一个完整的句子，但可以在句子里做成分，如：I don't know how much they cost.也就是是说，如果单独拿出C来，语法上不是一个句子。

B是疑问，C是陈述语