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试题详情及答案解析
—Is Bob still a volunteer?
—No, but he _____. He worked for the 2008 Beijing Olympic Games.
A.used toB.used to be
C.used to doD.was used to
答案:B
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