haven't you seen the notice "no photos_____here"?--- I am sorry,I _____________A,is allowed taking ,didn't notice B.should be allowed to take ,haven't noticed C.s allowed to take ,was not noticing D.should be allowed taking,was not noticing

haven't you seen the notice "no photos_____here"?--- I am sorry,I _____________A,is allowed taking ,didn't notice B.should be allowed to take ,haven't noticed C.s allowed to take ,was not noticing D.should be allowed taking,was not noticing
haven't you seen the notice "no photos_____here"?--- I am sorry,I _____________
A,is allowed taking ,didn't notice B.should be allowed to take ,haven't noticed C.s allowed to take ,was not noticing D.should be allowed taking,was not noticing

haven't you seen the notice "no photos_____here"?--- I am sorry,I _____________A,is allowed taking ,didn't notice B.should be allowed to take ,haven't noticed C.s allowed to take ,was not noticing D.should be allowed taking,was not noticing
选A,
allow doing sth.允许做某事
例：The hospital does not allow smoking.医院里不允许吸烟.
例句中No photos is allowed taking here.和这里的语法是一样的,photos和take构成被动,所以用allowed.
allow sb to do sth .允许某人做某事
例：Teacher allow students to have a short break after long trainning.
老师允许学生在长时间的训练以后稍作休息.
be allowed sb to do sth 被允许做某事
例：He is allowed to go to university for his good performance.
他因为表现好而被允许进入大学.
I didn't notice 表示我过去没注意到,当说话人告诉我的时候我已经注意到了,所以不能用B中的完成时,也不能用过去进行时.

c

选A

wdsdnnc 解释得非常好...

这个问题是四级以下的