A
1. Drinking water-------excessive enamel of teeth to become brittle and to chip off, leaving a stained or mottled effect.
(A) containing(B) in which containing(C) contains(D) that is contained
為什麼不能選c?逗號前不是沒有動詞?好奇怪喔?
版主: micki, miaoidio, marchmarch, spritee
正在浏览此版面的用户:没有注册用户 和 4 位游客