英语语法,请教一下解析的过程
问题描述：
英语语法,请教一下解析的过程
( ) to find words to express their gratitude, they silently grasped their hands.
选项:
a、they are unable
b、been unable
c、unable
d、as unable
答
英语语法,请教一下解析的过程 ( ) to find words to express their gratitude,they silently grasped their hands.选项:a、they are unableb、been unablec、unabled、as unable答：C译：不知道如何表达他们的感激之...