as a candidate for the post of school principal one must have at least ten years of teac

问题补充：

as a candidate for the post of school principal, one must have at least ten years of teaching experience.

A. Considered

B. To be considered

C. Having considered

D. Considering

答案：

A. Considered

(答案→)B. To be considered

C. Having considered

D. Considering

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