書名：怪物講師 閱讀
頁數：p.127
題目：
I ______ that the application form for the mortgage loan was recieved and fina
l decision will be made soon.
A. assure
B. have assured
C. was assured
D. was assuring
疑問：
為什麼答案是C不是B,不太能理解為什麼需要使用被動式
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