问题补充：
I don’t think teenagers should go to bars.
A. allow to
B. be allowed to
C. not allow to
D. be allowed
答案：
A. allow to
(答案→)B. be allowed to
C. not allow to
D. be allowed
解析：本题考查的是情态动词should be allowed to do sth，表示应该被允许做某事，故选答案为B
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