23. Constance Horner, chief of the United States government’s personnel agency, has recommended that the use of any dangerous or illegal drug in the five years prior to application for a job be grounds for not hiring an applicant.

(A) the use of any dangerous or illegal drug in the five years prior to application for a job be grounds for not hiring an applicant

(B) any dangerous or illegal drug, if used in the five years prior to applying for a job, should be grounds not to hire the applicant

(C) an applicant’s use of any dangerous or illegal drug in the five years prior to application for a job be grounds not to hire them

(D) an applicant’s use of any dangerous or illegal drug in the five years prior to applying for a job are grounds that they not be hired（A）

(E) for five years prior to applying for a job, an applicant’s use of any dangerous or illegal drug be grounds for not hiring them

答案没问题，想问下A和B中for not hiring 与 not to hire 在这里有什么优劣之别吗？二者用法上有什么不同？