C.why

　　D.when

　　解析:选D。此处考查定语从句。先行词为time，表时间，在定语从句中作状语，所以要用关系副词when来引导。

　　Ⅱ.完形填空

　　(2016·英语周报第1期) There was once a young ballerina(芭蕾舞女演员)who had taken ballet lessons all through her childhood.She wanted to be a leading ballet dancer，but she wanted to be___1__about this.When a ballet company came to town，she went backstage after the

　　__2__and spoke to the ballet master:“I want to be a great ballet dancer but I don’t know if I have the __3__at all.” The master said，“__4__for me.”After a minute or two，he shook his head and said，“No，no， no，you don’t have what it takes to be a __5__ballerina.”

　　The young woman went home__6__.She threw the ballet slippers into the closet and never wore them again.__7__she got married and had children.When the kids were__8__enough，she took

　　a part-time job__9__a cashier at a corner shop.

　　__10__later，the same ballet company came to town.She__11__the performance and on the way out，she__12__the same old ballet master who was then in his eighties.She__13__him that they had spoken before.She__14__him photos of her children and told him about the corner shop job that she was doing now.And then she asked，“There is just one thing that really__15__me for many years.__16__could you tell me that I don’t have what it takes to be a great ballerina？”

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