I don't know why the door remains _____.
(a) shutting
(b) locked
(c) opened
(d) closing
答案:(b)
请问有人可以帮我解释为什么答案是b吗?谢谢!
还有remain用法怎么用呢?谢谢

(b)和(c)这两个都是对的答案。"Remain" has a few different uses.

c opened 应该改为 open (adj)d close 改为 closed

答案B无误!后面就接进行式跟被动式,看句子的描写