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-What about the student in your class, Mr. Wang?-The doctor said that sleep caus

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-What about the student in your class, Mr. Wang?-The doctor said that sleep caus

—What about the student in your class, Mr. Wang?

—The doctor said that          sleep caused him poor memory and poor concentration.

A.lacking ofB.lacked inC.lackingD.lack for

试题答案

C

解析