I haven’t seen you for a couple of days. What have you been up _____?
A．inB．toC．withD．for
B
考查詞組be up to在口語中的含義“計謀什么（壞事）；做什么”。除此以外，be up to還表示時間、地點、程度“到…為止”、“是某人的責(zé)任；由某人決定”。
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