题目内容

He ______ for six years by the time he takes his examination.

A. was studying
B. would have been studying
C. had been studying
D. will have been studying

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A. used to be transported
B. used to being transported
C. was used to be transported
D. was used to being transported

A. 位于视网膜
B. 位于中央动静脉出入的部位
C. 位于视神经穿出视网膜的部位
D. 位于视神经盘
E. 位于节点

A. 看得见视标
B. 看不见视标

A. 节点到视网膜的距离
B. 物体的大小
C. 盲点投射区直径
D. 物像的大小
E. 物体至节点的距离