( )his telephone number, the manager had some difficulty getting in touch with the clerk.a.Not knowingb.Knowing notc.Not having knownd.Having not known这道题选哪个,选它的原因是什么,谢谢~
问题描述：
( )his telephone number, the manager had some difficulty getting in touch with the clerk.
a.Not knowing
b.Knowing not
c.Not having known
d.Having not known
这道题选哪个,选它的原因是什么,谢谢~
答
a
答
答案是A 这里是动名词短语做状语，不是状语从句，不需要考虑太多的。
答
我觉得，A就可以了，没有必要用完成时。
答
A. Not knowing
答
A.表原因,没必要用完成式
bd形式不对.