27 If nobody answers the door bell ,try ___ the back door.A to kn_英语解答

27 If nobody answers the door bell ,try ___ the back door.
A to knock at b.to knock c.knocking at d.knocking 需要详细分析

人气：368 ℃　时间：2020-05-23 19:36:55

解答

答案选C吧
try to do 表示"努力做某事"
try doing 表示"试着做..."