About 75 percent of all cadmium is used for cadmium plating of ______ such as iron and steel.
(A) easily corroded metals
(B) metals are easily corroded
(C) corroded metals that easily
(D) how easily metals corroded
Ans:A
答案為什麼不是B????
有看到一個解釋是說B會產生兩個謂語 那謂語又是什麼咧???
可以幫我解答一下嗎???
