摘要:第一节 语法和词汇知识 (共15小题,每小题1分.满分15分) 21. ----Will you go to Mary’s birthday party? ----No, invited, I can’t go to it. I’ll be too busy then. A. if B. unless C. even if D. when 22 universe is no longer mystery to us. A. The; a B. A; a C. /; a D. /; /

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