Have not you seen the notice"No photos___"?I am sorry ,i ___.A is_英语解答

Have not you seen the notice"No photos___"?I am sorry ,i ___.
A is allowed taking ,did not notice B is allowed to take ,was not noticing
谁能说明为什么

人气：493 ℃　时间：2020-05-11 07:29:16

解答

B
首先,is allowed to do sth 是正确用法
其次,一般会觉得was not noticing 别扭,但这是强调在刚才那个时间没有注意到,是对过去的动作的描述,所以用过去进行时态.