【題目】They prepared the food just now. (改為否定旬)
They the food just now.

【答案】didn't;prepare
【解析】根據(jù)prepared句子時態(tài)是一般過去時,謂語動詞是行為動詞,變否定句時借助于didn't,謂語動詞用原形,所以答案是:didn't prepare。

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