I haven’t seen you for a couple of days. What have you been up ?A. inB. toC. withD. for

问题补充：

I haven’t seen you for a couple of days. What have you been up ?

A. in

B. to

C. with

D. for

答案：

A. in

(答案→)B. to

C. with

D. for

解析：考查词组be up to在口语中的含义“计谋什么（坏事）；做什么”。除此以外，be up to还表示时间、地点、程度“到…为止”、“是某人的责任；由某人决定”。