单选题：At that time，we did not fully grasp the significance of what

题目内容：

At that time，we did not fully grasp the significance of what had happened． A．give
B．attach
C．lose
D．understand

参考答案：

答案解析：

A because ofB on 　　C becauseD with

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Plenty of practice in listening during the first years of life partly ensures ch

分类：卫生类题型：单选题