有关被动语态的英语题,怎么做,请写出解析?

This coat __washes____ (wash) well.
并不是所有的句子都可用被动语态来表达,下面的情况就不可用被动语态:
1.lock,open,read,sell, teach,transtate,wash,wirte用来说明主语的性质特征的,常与not, hardly, well, easily, badly, nicely连用.
That bike hardly sells.
2.表"称重,测量,花费,持续,发生"的状态动词或不及物动词,(weigh,measure,cost,last,break out,take place, happen
What haoppened to him last night?
3.属半系动词feel,look,sound,smell,taste
His theory sounded reasonable.
4.表"需要" need,want, require及形容词后的doing
This book is well worth byuing

应该填washes 本句译为“这件衣服很好洗” 这题考的是“用主动语态形式表达的被动语态” 类似的还有：
This book sells well in our shop .这本书在我们店里很好卖。
This pen writes comfortablly.这支笔写起来很舒服。

was washed