—Is Bob still a volunteer?

—No, but he _____. He worked for the 2008 Beijing Olympic Games.

A．used to B．used to be

C．used to do D．was used to

 

B

【解析】

試題分析：考察省略句。used to do意為過去做某事。句意：—Bob還是志愿者嗎？—不是，但他過去是的，他曾經(jīng)做過第2008屆奧運會的志愿者。省略句通常省到be動詞或情態(tài)動詞為止，此處的動詞應(yīng)為問句中的is。故選B

考點：考察省略句

 

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