do you know when the first train _ in China?a:wdo you know when t_英语解答

do you know when the first train _ in China?a:w
do you know when the first train _ in China?a:was produced B:is produced.c:produced.d:have produced

人气：168 ℃　时间：2020-03-26 15:53:48

解答

选a被动式和过去式