89. At that time I had no idea ________ I could hand it to him without being seen.A. if B. how C. which D. that how为什么选B? D有什么不对?
问题描述：
89. At that time I had no idea ________ I could hand it to him without being seen.
A. if B. how C. which D. that how
为什么选B? D有什么不对?
答
状语从句 how做引导词，就不用that了
答
这个句子直译过来就是：那个时候,我不知道怎样把它给他而不被看见.
how引导的句子作为宾语补足语,进一步来阐述idea,而作为连接词的that在此就没有存在的意义了.
注：一般情况下,从句之前的引导词how,what,which,where等和that互不兼容.当that和它们之间任何一个用在一起来引导从句的时候,就构成了语法上的错误.