英文文法一題

The hot curry masked the taste of the meat which was no longer what it ___ .

(1) is (2) was (3) should be (4) should have been

這題實在選不出來,麻煩每個選項都替我解釋,越清楚越好,謝謝~
更新: 很感謝Beth大的解答,看的出來你很認真在替我解決問題 。
一開始你的解答其實我看不太懂,可能程度還不夠。
但是改以時態來解,這我就理解了! 再次感謝你!
3 個解答 3