[題目] Longman Intermediate 4/e P197 Q1
書名：Longman Intermediate 4/e
頁數：p.197 Q1
題目：
We expect to finish renovations on the building by the end of the month.
In fect, work on the first and second floor offices ____ completed.
(A) has been
(B) have been
(C) were
(D) are
疑問：為什麼是(A)has been? 不能用have been嗎?這兩種的差別又在哪裡?
我實在搞不太懂~ 請大大解答一下,謝謝.
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