5．While Helen the piano.her mother came in． A．Was playing B．is playing C．played D——青夏教育精英家教网—

摘要：5．While Helen the piano.her mother came in． A．Was playing B．is playing C．played D．plays

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While Helen ________ the piano，her mother came in．

A．was playing B．is playing C．played D．plays

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