We have been expecting Rio 2016 Olympics_______ the Olympic flame（圣火） was lit.

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were expecting are expecting had expected expect

are； expect    were； had expected
   have been；were expecting    are； were expecting

are; expect were; had expected have been; were expecting are; were expecting

expected were expecting are expecting have been expecting

were expecting are expecting have expected Expect

if unless since though

added to add adding having been added

were expecting are expecting had expected expect

are; expect were; had expected have been; were expecting are; expecting

are； expect were； had expected have been；were expecting are； were expecting

has run out ;am expecting is running out ;expected has run out ;have been expected is running out;have been expecting

are; expect were; had expected have been; were expecting are; were expecting

were expecting are expecting had expected expect

added to add adding having been added

expected were expecting are expecting have been expecting

what; that /; what /; that which; what

added to add adding having been added

are； expect were； had expected have been； were expecting are； were expecting

expected are expecting have been expecting have been expected