By the end of the year he _____ in the army for 30 years.A、will have servedB、wi

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问题 By the end of the year he _____ in the army for 30 years.

选项 A、will have served
B、will serve
C、will be serving
D、will be served

答案 A

解析考查将来完成时的用法。by the end of是完成时的标志性时间短语，结合其后的the year可知是将来的时间。故需用将来完成时，选A。

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