Mary b____ a good doctor last year.补充单词

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Maryb____agooddoctorlastyear.补充单词Maryb____agooddoctorlastyear.补充单词Maryb____agooddoctorlastyear.补充单词b

Mary b____ a good doctor last year.补充单词
Mary b____ a good doctor last year.补充单词

Mary b____ a good doctor last year.补充单词
became

became

became

became
become的过去式,“成为”的意思

became (become became become)
结尾是last year,所以应用过去时。
这个和since last year不同,有since\for 等时间副词的句子才应该用完成时。