She left school three years ago and has worked as a nurse ________.A since then B ever since 填哪个?为什么?

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• She left school three years ago and has worked as a nurse ever since.ago能换成before吗?ago是以过去
• She left school three years ago and has worked as a nurse ever since.ago能换成before吗?ago是以过去的时间为标准,而这道题是用现在的时间为标准,符合before
• She left school three years ago and has worked as a nurse ________.A since then B ever since 填哪个?为什么?
• She left school three years ago and has worked as a nurse ever since.ago能换成before吗?ago是以过去的时间为标准,而这道题是用现在的时间为标准,符合before
• She has worked in the school for three yearsShe has ____ _______the school ______three years