[ Past Perfect or Past Perfect Continuous ]
When the constable rushed into the street, the thieves ________ into the thin air.
A. had already vanished
B. had already been vanishing
C. had already vanish

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Detroit ___ as the first capital city of Michigan, but now Lansing is the capital city of Michigan.
a. chosen
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We ________ a taxi home last night.
A. had
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