[題目] 怪物講師多益3回模擬試題p.23

書名：怪物講師教學團隊的多益3回全真模擬試題
版本：2/e
頁數：p.23 第122題
題目：
Items____ behind by passengers in the cabin will be retained at the Lost&Found office at the arrival terminal for three business days before being transferred to the local law enforcement.

(A) having been left
(B) have been left
(C) that have left
(D) are left

疑問：為甚麼是A而不是B

--