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 ________.A since then B ever since 填哪个?为什么?

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 ________.
A since then B ever since 填哪个?为什么?

She left school three years ago and has worked as a nurse ________.A since then B ever since 填哪个?为什么?
A
ever since 后面要加自从……起
since then 可以单独用,意思是自从那时起