[題目] 想問兩題文法
書名：新多益核心文法與解題練習
頁數 p 78 p 91
題目：
The living room air conditioner is _______ by the two repairmen who
arrived about an hour ago.
(A)repair
(B)repairing
(C)repaired
(D)being repaired
答案是D
疑問：請問選C是錯在哪呢?
The petition states that all parties _________ should sign the document
and include a printed name,current address, and telephone number.
(A)concern
(B)to concern
(C)concerned
(D)concerning
答案為C
疑問:答案應該是which are concerned的省略(我想)，我對concern的主動、被動用法
一直不太明瞭，請高手解釋一下，謝謝。
第一次發文 還請大家請多指教
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