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7、 (2011年陕西宝鸡检测)Mary,I should tell you it is the third time that you________.

A.forgot to do                         B.forgot doing

C.have forgotten to do             D.had forgotten doing

7、解析:选C。考查时态和非谓语动词。“It is(was)the+序数词+time+that从句”,表示“是某人第几次做某事”。在此句型中,若前面为it is,则that从句用现在完成时;若前面为it was,则that从句用过去完成时。而forget to do sth.表示忘了应去做某事,forget doing sth.表示忘了已做过某事。根据语意可知此题应选C。

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 (2011年陕西宝鸡检测)Mary,I should tell you it is the third time that you________.

A.forgot to do                         B.forgot doing

C.have forgotten to do             D.had forgotten doing

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