I think teenagers to choose their own clothes.A. be allowingB. should be allowedC. be all

问题补充：

I think teenagers to choose their own clothes.

A. be allowing

B. should be allowed

C. be allowed

D. should allowed

答案：

A. be allowing

(答案→)B. should be allowed

C. be allowed

D. should allowed

解析：句意：我认为青少年应该允许选择自己的衣服。Teenagers青少年，与动词allow是被动关系，所以用被动语态，be+过去分词，前面有情态动词should，be用原形，故选B。