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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. Once ____, such a chance might never come again.
A. losing B. lost C. to be lost D. having lost
7. That unforgettable ball was the last happy moment ____ I enjoyed myself.
A. when B. that C. which D. where
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. Once ____, such a chance might never come again.
A. losing B. lost C. to be lost D. having lost
7. That unforgettable ball was the last happy moment ____ I enjoyed myself.
A. when B. that C. which D. where
