初产妇，23岁。妊娠合并心脏病，按常规第一产程给予镇痛剂，但可能因药物导致宫缩乏力，产妇使用的药物是（）。

A.镇痛剂芬太尼

B.镇静剂水合氯醛

C.镇静剂三溴合剂

D.镇痛剂二氢埃托啡

E.镇痛剂哌替啶

Dina, （）for months to find a job as a waitress, finally took a position at a local advertising agency.

A. struggling

B. struggled

C. having struggled

D. to struggle