Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming ever more independent on information-based industries.
A. lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming
B. lack math skills to a large enough degree that they will make it difficult to absorb into a city's economy that becomes
C. lack of math skills is so large as to be difficult to absorb them into a city's economy that becomes
D. are lacking so much in math skills as to be difficult to absorb into a city's economy becoming
E. are so lacking in math skills that it will be difficult to absorb them into a city economy becoming
答案选E，但是这样lack不就作动词了吗，但是lack作动词不是不能用进行时态吗？而且一般用法是lack sth. 和be lack of sth. 吧？还有就是them是不是也是指代错误啊？becoming 和 that becomes 怎么判断？非常感谢！
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