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Fill in the blanks with the correct form of the verb in parentheses to complete the text accurately: "By the time we arrived at the concert, the band ______ (start) already, and they ______ (play) for about ten minutes. We ______ (not, find) our seats quickly because the area ______ (be) very crowded."
started, were playing, hadn't found, was
had started, were playing, couldn't find, was
had started, had been playing, didn't find, was
have started, were playing, couldn't find, had been