[题目]I haven't seen you for a couple of days. What have you been up ?A．inB．toC．withD．for 题目和参考答案——青夏教育精英家教网—

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【题目】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】B

【解析】be up to sth.“在做某事”。后一句句意：你一直在忙什么事情？

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