第二节 语法和词汇知识（共15小题；每小题1分，满分15分）
从A、Ｂ、Ｃ、Ｄ四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
6.After he had won the first prize, Mr. Su ____ to a restaurant to celebrate with us.
A. went          B. has gone     C. would go    D. had gone