I haven’t seen you for a couple of days . What have you been up ____?A．in B．toC．
题型：不详难度：来源：
| I haven’t seen you for a couple of days . What have you been up ____? |
答案
| B |
解析
| be to 在干什么。好久未见了，他在忙些什么？故选B。 |
举一反三
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