Once employed,Simon____to Africa to do the market research.A.is sent B.has been sentC.was sent D.will be sent为什么不能选C?

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be employed Once employed,Simon____to Africa to do the market research.A.is sent B.has been sentC.was sent D.will be sent为什么不能选C? 英语翻译 regularly employed men. seif-employed workers中文翻译 operating capital employed self employed怎么翻译 self-employed teacher是什么意思 properly employed什么意思? currently employed什么意思 Self-employed怎么读 I am self employed fully employed 的意思 once! once once Once once Once