they will go to hainan this winter,but they ___ when to leavea.didn't decideb.have never decidedc.have dicidedd.haven't decided

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theywillgotohainanthiswinter,butthey___whentoleavea.didn''tdecideb.haveneverdecidedc.havedicidedd.hav

they will go to hainan this winter,but they ___ when to leavea.didn't decideb.have never decidedc.have dicidedd.haven't decided
they will go to hainan this winter,but they ___ when to leave
a.didn't decide
b.have never decided
c.have dicided
d.haven't decided

they will go to hainan this winter,but they ___ when to leavea.didn't decideb.have never decidedc.have dicidedd.haven't decided
选d,现在完成时