i (send) an e-mail to her once a week since i left her city将括号里单词的正确形式填在空里空在 send 前面

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i (send) an e-mail to her once a week since i left her city将括号里单词的正确形式填在空里空在 send 前面

i (send) an e-mail to her once a week since i left her city将括号里单词的正确形式填在空里空在 send 前面
i (send) an e-mail to her once a week since i left her city
将括号里单词的正确形式填在空里
空在 send 前面

i (send) an e-mail to her once a week since i left her city将括号里单词的正确形式填在空里空在 send 前面
have sent
现在完成式
since,自从的意思.看到这个字基本上都会是现在完成式