—What about the student in your class, M...

—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

C 【解析】本题中的动词lack缺少，是一个及物动词，后面可以直接加宾语。动词短语Lack sleep缺少睡眠；在本句中lacking sleep在句中做主语。句义：—王老师，你们班级的那个学生情况怎么样？—医生说缺少睡眠导致他记忆力很差也导致他无法集中注意力。故C正确。

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