lack作名词是be a lack of 还是be lack of

lack作名词是be a lack of 还是be lack of 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 a lack of 和lack of 有什么区别?这俩个词组中lack都是名词,但是有什么区别呢? The office has to be shut down __ funds.选项是being a lack,from lack of,to a lack of,for a lack of答案选的d,为什么? Lack anything,lack of 请问Lack of education is an obstacle of success.的句子成分?1.　lack 是作名词吗?2.　哪些情况下动词可以直接放在句首? lack相关短语的区别,be lack of,be lacking in ,lack sth,a lack of sth,等等并造句,如果还有其他相关短语,也请列出, 有没有be lack of这种用法?lack只有名词和动词词性,为什么见过be lack of的说法?这里的lack是名词的话没有冠词啊?还有lack有什么常用的搭配?能与of连用吗? lack的用法请问a lack of、be lacking in和lack for用法上有什么区别? be short of 等于lack be lack of和be lack in区别 lack of lack of lack of The office has to be shut down ____ funds.[A] being a lack of [B] from lack of [C] to a lack of [DThe office has to be shut down ____ funds.[A] being a lack of [B] from lack of [C] to a lack of [D] for lack of.不太理解..除了语感之外能否 lack of和a lack of的区别? lack of 和 a lack of的区别 lack是a lack of还是lack of 可数么?There is no lack of vegetable. a lack of money.缺乏金钱lack of packing缺少包装lack of penetration未焊透, 未熔穿lack of proportion比例失调怎么一会有a 一会没有?