Ann used to concentrate more on clothes than studies.(改为否定句)Ann ___ ___ /___ to concentrate more on clothes than studies.

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Ann used to concentrate more on clothes than studies.(改为否定句)Ann ___ ___ /___ to concentrate more on clothes than studies.
Ann used to concentrate more on clothes than studies.(改为否定句)
Ann ___ ___ /___ to concentrate more on clothes than studies.

Ann used to concentrate more on clothes than studies.(改为否定句)Ann ___ ___ /___ to concentrate more on clothes than studies.
Ann didn't use to concentrate more on clothes than studies.
或:
Ann usedn't to concentrate more on clothes than studies.