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B.C.D四个选项中，选出可以填入空白处的最佳选项。 We ____last night, but we went to the concert insteaD. A. must have studied might study should have studied would study
had been; have met have been; have met had been; had met have been; had met
set out carry out keep out put out
have met; were studying met; were studying met; studied have met; studied
met have met were meeting had met
had been； have met have been； have met had been； had met have been； had met
met meet have met had met
met; do met; did had met; did have met; do
had been; have met have been; have met had been; had met have been; had met
we’d meet them we’ll meet them we ’d have met them we’ve met then
we have we do we are I am
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