They left Beijing after two weeks.对after two weeks进行提问.___ ___ they ____Beijing?

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They left Beijing after two weeks.对after two weeks进行提问.
___ ___ they ____Beijing?

问题有一个小小的错误哟.
这个句子是一般将来时,怎么会用过去式呢?
把left 改为will leave.
那么答案为When will they leave Beijing?