It has been ten years since she ______ a nurse.

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问题 It has been ten years since she ______ a nurse.

选项 A、is
B、has been
C、was
D、had been

答案C

解析她不当护士已经10年了。如果since从句的谓语动词是无限动词或静态动词，则一般表示动作或状态的结束，并无持续性。was a nurse表示状态已结束，故选C.

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大学英语三级B级

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