過去完成進行時和過去完成時的比較

She had cleaned the office, so it was very tidy.

她已經(jīng)打掃過辦公室了，所以很整潔。(強調(diào)結(jié)果)

She had been cleaning the office, so we had to wait outside.

她一直在打掃辦公室，所以我們不得不在外面等著。(強調(diào)動作一直在進行)

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