Mr.Fagan notified...請幫我翻一下好嗎??

Mr.Fagan notified securtiy_______he noticed something suspicious.
正解是although
想請問這句是什麼意思..
為啥不可以用because of??

謝謝大家!!
更新: 對不起啦..我正解寫錯了.
正解是填when才對....
我看錯了!!~
2 個解答 2