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Do you know how long it has been _______...

Do you know how long it has been _________service ?

A. on           B. at        C. in           D. for

 

C 【解析】 试题分析:句意:你知道它投入服务多久了吗?in service投入服务,故选C。 考点:考查介词辨析。  
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