【題目】---Is your Uncle Tom a soldier?

---No, but he once _______ in the army for 4 years.

A. served B. is serving

C. has served D. was serving

【答案】A

【解析】

考查時態(tài)。句意：——你的叔叔Tom現(xiàn)在是一名士兵嗎？——不是，但是他曾經(jīng)在軍隊里服役4年。serve可以作為及物動詞“服務(wù)”，也可以作為不及物動詞“服役”，本句中serve in the army在軍中服役，中的serve是不及物動詞。根據(jù)句意和once“曾經(jīng)”可知句子用一般過去時態(tài)，故選A。

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