I haven't seen you for a couple of days.What have you been up ________?A．in B．to C．with DI haven't seen you for a couple of days.What have you been up ________?A．in B．toC．with D．for

I haven't seen you for a couple of days.What have you been up ________?A．in B．to C．with DI haven't seen you for a couple of days.What have you been up ________?A．in B．toC．with D．for
I haven't seen you for a couple of days.What have you been up ________?A．in B．to C．with D
I haven't seen you for a couple of days.What have you been up ________?
A．in B．to
C．with D．for

I haven't seen you for a couple of days.What have you been up ________?A．in B．to C．with DI haven't seen you for a couple of days.What have you been up ________?A．in B．toC．with D．for
to
what have you been up to是口语句型,意为你最近在忙啥