When the constable rushed into the street, the thieves ________ ...

★ 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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When Tommy came up, the girls ________ for a long time.

A. had sung

B. had been singing

C. had sing