lack的用法1.lack(for) sth.缺少 2.be lacking (in) sth.缺乏.3.(a) lack of....方面的短缺三种用法完全混在一起,例句：1.Alex's real promble is that he lacks confidence.2.He seemed to be lacking in courage 3.Lack of vitamin B can produce a variety of symptoms网上查的回答完全不能解释我的疑问~求正解.---What about the student in your class,Mr.Wang?---The doctor said that sleep caused him poor memory and poor concentration.A.lacking of B.lacked in C.lacking D.lack for 英语
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【答案】 1.lack sth. lack做动词；
2.be lacking in. lacking为形容词
3. lack of.. 整体可以做主语或宾语 追问： 谢谢，但是能帮忙解答一道题目吗？因为不会具体应用。。 1.---What about the student in your class,Mr.Wang? ---The doctor said that __ sleep caused him poor memory and poor concentration. A.lacking of B.lacked in C.lacking D.lack for 追答： C正确 A 应该是 the lack of