they have -------(been,arrived)in shanghai for 2 days.

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theyhave-------(been,arrived)inshanghaifor2days.theyhave-------(been,arrived)inshanghaifor2days.they

they have -------(been,arrived)in shanghai for 2 days.
they have -------(been,arrived)in shanghai for 2 days.

they have -------(been,arrived)in shanghai for 2 days.
been

been

been
后面有一段时间 用延续性动词

been,延续的时间要和延续性动词连用

been 。。。