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.
在继续进行仔细检验的同时,医生们还检测了用以对抗A类病毒所有已知子群的药物的效用。

选项 A、 
B、 
C、 
D、 

答案B

解析
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