题目内容
用括号内所给动词的适当形式填空。
By the end of last year, Mary ________(send)twenty e-mails to her pen friend, Jack.
答案:had,sent
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题目内容
用括号内所给动词的适当形式填空。
By the end of last year, Mary ________(send)twenty e-mails to her pen friend, Jack.