单选题

All morning as she waited for the medical report from the doctor, her nervousness _____.

A has grown

B is growing

C grew

D had grown

解析：
句意：她一整个上午都在等待医生的体检报告，紧张感也不断增强。本题考查动词时态。as引起的时间状语从句，要求主句动作与从句同时发生。本题从句的谓语动词是过去时waited，由此可推知主句谓语动词亦应为过去时，故C项正确。