— I'm mad at what Jack said yesterday—! He was just making a joke．A. Take your time B. Li

问题补充：

— Im mad at what Jack said yesterday．

—! He was just making a joke．

A. Take your time

B. Lighten up

C. Enjoy yourself

D. Not at all

答案：

A. Take your time

(答案→)B. Lighten up

C. Enjoy yourself

D. Not at all

解析：句意，这是两个人之间的对话。第一个人说：“我对昨天杰克说的话感到愤怒。” 第二个人说： “别担忧，他只不过是开了一个玩笑。” Take your time别着急 Lighten up 别担忧Enjoy yourself玩的开心 Not at all别客气，故选B，最符合题意。