At that time I had no idea ________ I could hand it to him without being seen.

题目

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
选B为什么不选D

答案

have no idea= don't know （ 不知道 ）
其后可直接跟特殊疑问词引导的陈述句.
译文：那时,我不知道怎样才能偷偷地将东西交给他.