Make sure not to close your eyes when___A.photographed B.photographingC.taken photos D.taking photos为何选A不选C或D
问题描述：
Make sure not to close your eyes when___
A.photographed B.photographing
C.taken photos D.taking photos
为何选A不选C或D
答
若选C或D则句子中须有主语
答
D
答
选A关键是主语和动词的被动关系
C好像没有taken photos的说法,只有photos were taken
D应该是when you taking photos
答
被动，主语是你。