They havn't decided when---for shanghaiA to be leaving B to leave C leaving D leave

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Theyhavn''tdecidedwhen---forshanghaiAtobeleavingBtoleaveCleavingDleaveTheyhavn''tdecidedwhen---forshan

They havn't decided when---for shanghaiA to be leaving B to leave C leaving D leave
They havn't decided when---for shanghai
A to be leaving B to leave C leaving D leave

They havn't decided when---for shanghaiA to be leaving B to leave C leaving D leave
B 固定搭配 decide to do

B 疑问词+to do