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—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】

试题分析:考察省略句。used to do意为过去做某事。句意:—Bob还是志愿者吗?—不是,但他过去是的,他曾经做过第2008届奥运会的志愿者。省略句通常省到be动词或情态动词为止,此处的动词应为问句中的is。故选B

考点:考察省略句

 

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