A.Do you think when B.when do you thinkC Do you think how long D.how long do you think为什么选B而不选A?不是一般都是Do you think 或是 I don't think 这类后面再加上一个定语从句即陈述语句构成句子吗?为什么这句do you think 要当做插入语用?麻烦高人详细解答,感激不尽!