he told us that he wouldn't believe how quickly his english ----A.had improved B.hadbeenimproved 谢

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he told us that he wouldn't believe how quickly his english ----A.had improved B.hadbeenimproved 谢
he told us that he wouldn't believe how quickly his english ----A.had improved B.hadbeenimproved 谢

he told us that he wouldn't believe how quickly his english ----A.had improved B.hadbeenimproved 谢
选择B,这里是个被动语态
english was improved
improved english