400-600-1123
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答案：
D
考点：主谓
一致 表达习惯
分析：主语是the lack，谓语动词需用单数形式；习惯用法make it difficult to do sth.
考点：
A.主谓不一致；
B.主谓不一致；
C.主谓不一致；
D.正确；
E.不符合表达习惯； 
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