单选题 Harry: I didn"t know you play billiards. Are you having fun?
John: I"m having a great time. ______ What are you doing?

A、 Great!
B、 How about you?
C、 I miss it so much.
D、 Do you know billiards?

【正确答案】 B

【答案解析】[解析] “I"m having a great time”用来回应前面的问题“Are you having fun?”。后面的表达法为反问对方，B项的“How about you?”引导后面的问句“What are you doing?”。这两个句子互相关联。其他选项表达法与此处的语境不符。