路基回填材料要求:27 If nobody answers the door bell ,try ___ the back door.

来源:百度文库 编辑:查人人中国名人网 时间:2024/04/30 01:30:44
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
答案不是A

答案选C吧

try to do 表示"努力做某事"

try doing 表示"试着做..."

c,辞典看错,不好意思