[文法] 問一題文法
what was causing the door of the metal cabinet___________???
A to vibrate
B vibrate
C vibrating
D vibrated
答案是A,可是我一直想不通
我知道不會是C,因為櫃子不是正在搖動
D表被動也不行
但為什麼答案不能是B???
一定要加個to才是標準答案
以前上課只記得to是加在兩個動詞中間的
還是這題是例外??
請大家多指教了
謝謝
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