優選考古題分析（97普考）
I have always regretted not having studied harder at school. I
More diligent at that time.
(a) had been (b)should be (c) was (d) should have been

詳解：
答案：D
翻譯：我一直懊悔在求學時沒有用功一點，我當時應該更勤奮些。

解析：
由第一句have regretted(感到懊悔)，第二句的時間副詞at the time 及關鍵字more diligent(更用功些)可知，本題應選（D）should have been。Should+have+Vp.p用來表對過去該做而未做之事。

　　　　　　　　　　　　　　　　　　　　　 資料來源（公職英文全攻略）

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