Although______expenses works well when applying for a contract,
clients appreciate itemization on their invoices.
(A) estimate (B)estimator (C)estimating (D)estimation
答案是C
我第二次複習, 還是錯在這題
Although+S+V, 所以我一直不太確定是省略S, 加Ving 嗎？
先謝謝大家

跟後面的主詞一樣所以省略 動詞改ving保留

although是連接詞主詞: estimating expenses動詞: workswhen可當連接詞也可當介系詞，這裡當介系詞，後面接名詞: "applying for a contract"另一個主詞: clients另一個動詞: appreciate

https://pttweb.tw/toeic/m-1484157199-a-f3f.html對照這一題 https://goo.gl/mtCneR