问题
选择题
—Does Liu Hui serve in the army?
—No, but he ________ in the army for three years.
A．served
B．has served
C．is serving
D．would serve
答案
答案：A
由no是对前句的否定可知现在不在部队服役，是以前“服过役”，故用一般过去时。
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