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精英家教網(wǎng) > 高中英語 > 題目詳情

【題目】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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