A. To take a simple example, we assume that if we greet acquaintances in a friendly manner, they will accept and return our gree

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问题 A. To take a simple example, we assume that if we greet acquaintances in a friendly manner, they will accept and return our greeting.
B. Continuing their careful tests, the doctors checked the effect of drugs used against all the known subgroups of type A virus.
C. We are sure this was just due to carelessness in quality control, and that you will send another shipment promptly to replace this faulty one.
D. Some people think that the time to begin studying a foreign language is in childhood, and that the younger he is, the easier it is to learn another language.
有人认为开始学习外语的时间应该是童年时期,并且一个人越年轻,他学习另外一种语言就会越容易。

选项 A、 
B、 
C、 
D、 

答案D

解析
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