_____ his brother.[ ] A. These B. Those_爱下问搜题

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问题选择题

_____ his brother. [ ]

A. These

B. Those

C. They're

D. That's

答案

答案：D

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Ⅰ、Ⅱ型牙本质发育不全变化的共同特征是什么?

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什么是交叉渡线？