to lack in 怎么用啊 和 be lacking in 什么区别下面这句话用的什么句型?A person who holds a hand over his mouth when he is talking is signalling that he is lacking in confidence.

问题描述:

to lack in 怎么用啊 和 be lacking in 什么区别
下面这句话用的什么句型?A person who holds a hand over his mouth when he is talking is signalling that he is lacking in confidence.