英语中Lack的用法请问lack,a lack of,be lacking in这3个词有什么区别.我知道lack可以做动词和名词.a lack of是个名词词组,并且a可以省略.be lacking in是动词短语.它们3个的用法到底该怎么用.比如:1;Those old people___a general understanding of the present situation.A:lack of B:are lacking ofC:lack D:in lack of就这道题而言,我认为AC都可以的.2:The couple died because of___oxygen when bathing.A:lack B:a lackC:a lack of D:a lack for我也觉得AC都可以.怎么回事呢.希望英语好的可以尽快回答我.3:Though___money,hie motehr managed to send him to universityA:lacked B:lacki

英语中Lack的用法
请问lack,a lack of,be lacking in这3个词有什么区别.
我知道lack可以做动词和名词.a lack of是个名词词组,并且a可以省略.be lacking in是动词短语.
它们3个的用法到底该怎么用.
比如:
1;Those old people___a general understanding of the present situation.
A:lack of B:are lacking of
C:lack D:in lack of
就这道题而言,我认为AC都可以的.
2:The couple died because of___oxygen when bathing.
A:lack B:a lack
C:a lack of D:a lack for
我也觉得AC都可以.怎么回事呢.
希望英语好的可以尽快回答我.
3:Though___money,hie motehr managed to send him to university
A:lacked B:lacking of
C:lacking D:lacked in
选什么额,这个题根本不知道了.